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JAIDS Journal of Acquired Immune Deficiency Syndromes:
doi: 10.1097/QAI.0b013e31822f064e
Implementation and Operational Research: Epidemiology and Prevention

Barriers to Antiretroviral Initiation in HIV-1–Discordant Couples

Guthrie, Brandon L. PhD*; Choi, Robert Y. MD, MIA, MPH; Liu, Amy Y. MPH*; Mackelprang, Romel D. PhD*; Rositch, Anne F. PhD; Bosire, Rose MBChB, MPH§; Manyara, Lucy MBChB, MMed; Gatuguta, Ann MBChB, MPH; Kiarie, James N. MBChB, MMed, MPH#,**,††; Farquhar, Carey MD, MPH*,‡,‡‡

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*Department of Epidemiology, University of Washington, Seattle, WA

Department of Medicine, University of Washington, Seattle, WA

Department of Epidemiology, University of North Carolina

§Center for Public Health Research, Kenya Medical Research Institute, Nairobi, Kenya

Department of Ophthalmology, Kenya Medical Training College, Nairobi, Kenya

Department of Public Health, Kenyatta University, Nairobi, Kenya

#Department of Obstetrics and Gynecology, University of Nairobi, Nairobi, Kenya

**Institute of Tropical and Infectious Diseases, University of Nairobi, Nairobi, Kenya

††Kenyatta National Hospital, Nairobi, Kenya

‡‡Department of Global Health, University of Washington, Seattle, WA

Supported by National Institute of Health/the NIAID research grant (R01 AI068431); National Institute of Health–funded University of Washington STD/AIDS training grant (T32 AI07140) and Fogarty grant (D43 TW000007) and by the University of Washington Center for AIDS research.

These data were presented, in part, at the XVIII International AIDS conference, July 2010, Vienna, Austria (TUAB0206).

The authors have no conflicts of interest to disclose.

Supplemental digital content is available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal's Web site (http://www.jaids.com).

Correspondence to: Brandon L. Guthrie, PhD, 325 Ninth Avenue, University of Washington Box 359909, Seattle, WA 98104-2499 (e-mail: brguth@u.washington.edu).

Received April 1, 2011

Accepted July 15, 2011

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Abstract

Background: In Kenya and much of sub-Saharan Africa, nearly half of all couples affected by HIV are discordant. Antiretroviral therapy (ART) slows disease progression in HIV-1–infected individuals and reduces transmission to uninfected partners. We examined time to ART initiation and factors associated with delayed initiation in HIV-1–discordant couples in Nairobi.

Methods: HIV-1–discordant couples were enrolled and followed quarterly for up to 2 years. Clinical staff administered questionnaires and conducted viral loads and CD4 counts. Participants with a CD4 count meeting ART criteria were referred to a nearby US President's Emergency Plan for AIDS Relief–funded treatment center. Barriers to ART initiation among participants with a CD4 count eligible for ART were assessed by Cox regression.

Results: Of 439 HIV-1–infected participants (63.6% females and 36.4% males), 146 met CD4 count criteria for ART during follow-up. Median time from meeting CD4 criteria until ART initiation was 8.9 months, with 42.0% of eligible participants on ART by 6 months and 63.4% on ART by 1 year. The CD4 count at the time of eligibility was inversely associated with time to ART initiation (hazard ratio = 0.49, P < 0.001). Compared with homeowners, those paying higher rents started ART 48% more slowly (P = 0.062) and those paying lower rents started 71% more slowly (P = 0.002).

Conclusions: Despite access to regular health care, referrals to treatment centers, and free access to ART, over one-third of participants with an eligible CD4 count had not started ART within 1 year. Factors of lower socioeconomic status may slow ART initiation, and targeted approaches are needed to avoid delays in treatment initiation.

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INTRODUCTION

The benefits of antiretroviral therapy (ART) for improving survival and reducing transmission are well established,1–3 yet only an estimated 44% of people in sub-Saharan Africa needing ART are receiving it.4 Much attention has been placed on system-level barriers to ART initiation, with notable improvements in the availability of affordable treatment. Less attention has been devoted to individual-level barriers that may interfere with timely ART initiation despite the availability of drugs.

Prompt initiation of ART is of particular importance in HIV-1--discordant couples, where effective treatment not only benefits the infected partner but also significantly reduces the risk of transmission to their uninfected partner.3,5–7 While risk reduction in discordant couples must be a multifaceted approach, the dominant role of viral load in determining transmission risk argues strongly for a major focus on strategies to reduce viral load in the infected partner.8 Effective viral suppression through ART therefore has great potential as a prevention strategy, particularly when targeted at discordant couples.

Studies from South Africa showed that by 1 year after being diagnosed with HIV-1 and receiving a CD4 count eligible to start ART, only 39% had started treatment,9,10 and 1 important obstacle to maximizing ART coverage is poor retention in pre-ART care programs.11 New initiatives to promote provider-initiated testing are increasing the number of people who are aware of their HIV status, but patients tested in this way tend to have a lower rate of linkage to ongoing HIV care and ART initiation compared with those who initiate testing on their own.12 These findings highlight the great need to improve monitoring and ongoing care of patients through pre-ART programs and to expedite ART initiation rates once eligibility criteria are met.

In this study, we followed a cohort of HIV-1–infected participants in HIV-1–discordant relationships to determine the ART initiation rate. Both members of these couples were aware of their partner's HIV-1 status, and thus these couples represent a group of particular interest as a target for strategies to expedite ART initiation. We focused on factors that may serve as barriers to ART initiation in an attempt to better understand the decision process surrounding ART initiation and to identify potential intervention targets to improve initiation rates.

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METHODS

Study Participants

HIV-1–discordant couples were recruited from voluntary counseling and testing centers in Nairobi, Kenya, from September 2007 to December 2009. Participants consented to 2 years of follow-up with quarterly study visits as part of a study of HIV-1–specific cellular immune responses and HIV-1 transmission. Eligible couples reported sex ≥3 times in the 3 months before screening and planned to remain together for the duration of the study. Women could not be pregnant at enrollment and HIV-1–infected participants could not have a history of clinical AIDS (WHO stage IV) and were not currently on ART. At enrollment and follow-up visits, clinical staff administered a questionnaire including sociodemographic, sexual behavior, and medical history characteristics. Questionnaires were presented in English or Kiswahili depending on participant preference and were administered individually to ensure confidentiality. Low education was defined as less than a primary education (<8 years). Rent was categorized as lower rent (less than the median) or higher rent (greater than or equal to the median), and income was calculated as the combined income for both partners in the couple.

Distance between the participant's residence and the treatment center to which participants were referred for ART assessment was estimated using locator information provided by each participant. Based on this information, a study team member mapped the residences using a web-based mapping application. The resulting coordinates were used to estimate driving distances using a geospatial algorithm to generate driving routes (Google, Inc, Mountain View, CA).

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Laboratory Methods

CD4 cell counts were measured on blood samples collected at enrollment and every 6 months during follow-up using a FACSCalibur flow cytometer (BD Bioscience, Franklin Lakes, NJ), and HIV-1 RNA levels were measured in plasma from blood samples collected at enrollment using the Gen-Probe HIV-1 viral load assay (Gen-Probe Incorporated, San Diego, CA) as previously described.13 Urine pregnancy tests (Quick Vue One Step hCG Urine Pregnancy kit, Quidel Corp, San Diego, CA) were done on all women at enrollment and at each quarterly follow-up visit.

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ART Eligibility

Eligibility to start ART was based on CD4 count, with the eligibility threshold set by Kenyan national guidelines. These guidelines changed during the follow-up period, resulting in a change in the CD4 level at which participants were referred for ART evaluation. Between September 1, 2007, and October 1, 2009, ART eligibility was based on a CD4 count <200 cells per microliter; and between October 2, 2009, and November 30, 2010, ART eligibility was based on a CD4 count <250 cells/μL. Participants with an eligible CD4 count were referred to a comprehensive care center funded by the US President's Emergency Plan for AIDS Relief and located approximately 500 meters from the study clinic. Evaluation for ART initiation at the comprehensive care center involved a CD4 count conducted independently of the CD4 count provided by the study.

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ART Initiation

At each quarterly follow-up visit, participants were asked if they had started ART since their last study visit. Additionally, at the end of the study, participants were asked if they had started ART during the study period, and if so, when they had started therapy. The date of ART initiation was based on the self-reported date of starting ART or the midpoint between the last visit not on ART and the first visit on ART if an exact date was not available. The definition of starting ART did not include short-course use of antiretroviral drugs for prevention of mother-to-child transmission of HIV during pregnancy or breastfeeding.

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Statistical Methods

The Kaplan–Meier product-limit estimate was used to determine the cumulative incidence of starting ART. Cox proportional hazards regression was used to assess time to ART initiation and to investigate barriers to ART initiation among participants with an eligible CD4 count. In these models, a hazard ratio (HR) >1 indicates faster ART initiation, whereas a HR <1 indicates slower initiation. Participants were administratively censored at the end of their scheduled follow-up period. Participants that were lost to follow-up or died before ART initiation were censored after the last attended study visit.

In a secondary analysis, we also determined if time-varying ART use was associated with a women becoming pregnant. A Cox proportional hazards model was used, which allowed ART status to change over time from “pre-ART” to “on-ART” after ART initiation. In the resulting model, the hazard ratio for ART indicates the likelihood of a woman becoming pregnant once on ART relative to the likelihood of becoming pregnant while not on ART at a given time since enrollment. In a related longitudinal analysis, generalized estimating equation regression with a log link was used to compare the likelihood of reporting current hormonal contraceptive use between women on ART and those not yet on ART.

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RESULTS

Participant Characteristics

We followed 439 HIV-1–infected participants from HIV-1–discordant couples, of which 279 (63.6%) were female. At enrollment, the median CD4 count was 405 cells per microliter (interquartile range: 280 to 586), with 51 (11.7%) below 200 cells per microliter, 115 (26.4%) in the range of 200 to 350 cells per microliter, 112 (25.7%) in the range of 350 to 500 cells per microliter, and 158 (36.2%) ≥500 cells per microliter. There were some relevant differences between the male and female HIV-1–infected participants (Table 1). Females tended to be younger (median age 28 years vs. 36 years) and reported a shorter relationship duration with their uninfected partner (median duration 4.8 years vs. 6.0 years) compared with males. Female CD4 counts tended to be higher (median CD4 count 450 vs. 356) and viral loads tended to be lower among females (median log10 viral load 4.6 versus 4.8 copies/mL).

Table 1
Table 1
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ART Initiation Rates in the Study Population

We assessed ART initiation among the entire cohort, whether the participant had an eligible CD4 count or not. Of the 439 HIV-1–infected participants followed, 130 (30%) reported starting ART during the study period, 278 (63%) were administratively censored at the end of follow-up, 7 (2%) died before ART initiation, and 24 (5%) were lost to follow-up. The cumulative incidence of ART initiation was 18.7% by 1 year and 31.9% by 2 years. Lower baseline CD4 count [HR = 1.92 per 100 cells/μL decline, 95% confidence interval (CI): 1.69 to 2.18] and higher baseline viral load (HR = 1.63 per log10 copies/mL, 95% CI: 1.35 to 1.97) were associated with significantly faster ART initiation. After adjusting for baseline CD4 count, faster ART initiation was observed among participants with higher viral loads (HR = 1.24 per log10 copies/mL, 95% CI: 1.03 to 1.49), those that reported owning their own homes compared with nonhomeowners (HR = 2.09, 95% CI: 1.25 to 3.49), and those reporting longer relationship durations (HR = 1.11 per 5 years, 95% CI: 1.00 to 1.25). Additionally, women on hormonal contraceptives at enrollment initiated ART more slowly than women not on hormonal contraceptives (HR = 0.50, 95% CI: 0.25 to 0.99).

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Time to an Eligible CD4 Count

By 1 year of follow-up, 28.5% of participants had a CD4 count consistent with eligibility to start ART (<200 cells/μL before October 1, 2009, and <250 cells/μL after October 1, 2009). The strongest predictor of time to an eligible CD4 count was lower baseline CD4 count (HR = 2.84 per 100 cells/μL decline, 95% CI: 2.43 to 3.31). After adjusting for baseline CD4 count, those with higher viral loads had shorter time to an eligible CD4 count (HR = 1.21 per log10 copies, 95% CI: 1.02 to 1.43). There were no significant associations between time to an eligible CD4 count and age (HR = 1.01, 95% CI: 0.99 to 1.03, P = 0.560), female gender (HR = 0.87, 95% CI: 0.63 to 1.19, P = 0.378), relationship duration (HR = 1.01, 95% CI: 0.98 to 1.03, P = 0.658), or homeownership (HR = 1.30, 95% CI: 0.77 to 2.20, P = 0.319).

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Barriers to ART Initiation Among Those With an Eligible CD4 Count

After a CD4 count that met guidelines to begin ART, HIV-1–infected participants were followed for ART initiation. A total of 146 participants had an eligible CD4 count, of which 81 (55.5%) were female. Of those with a qualifying CD4 count, 94 (64%) started ART during follow-up, 47 (32%) were administratively censored at the end of follow-up, 3 (2%) died before ART initiation, and 2 (1%) were lost to follow-up. The median time from meeting CD4 criteria until ART initiation was 8.9 months (95% CI: 6.0 to 10.0). By 6 months from the eligible CD4 count, 42.0% of participants had started ART; and by 1 year, 63.4% were on ART. The magnitude of the eligible CD4 count was strongly inversely related to the time until ART initiation after an eligible CD4 count, with 56.3% on ART by 6 months among those with an eligible CD4 count <100 compared with 42.6% among those with a CD4 count of 100 to 200 (HR = 0.40, 95% CI: 0.22 to 0.70), and 32.2% among those with a CD4 count of 200 to 250 (HR = 0.38, 95% CI: 0.19 to 0.76) (Fig. 1).

Figure 1
Figure 1
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Factors related to socioeconomic status were investigated as potential barriers to ART initiation. After adjusting for eligible CD4 count, homeownership (HR = 1.94, 95% CI: 1.07 to 3.53) was significantly associated with faster ART initiation. When further stratified by rent, homeowners started ART at the fastest rate, those paying higher rents started ART at an intermediate rate, and those paying lower rents started at the slowest rate (Fig. 2). A multivariate model was fitted that included socioeconomic factors (see Table, Supplemental Digital Content 1, http://links.lww.com/QAI/A213), further supporting the relationship between the rate of ART initiation and homeownership and the amount of rent paid, with a stepwise decline in ART initiation from homeowners to those paying higher rents (HR = 0.52, 95% CI: 0.26 to 1.03, P = 0.062) to those paying lower rents (HR = 0.29, 95% CI: 0.13 to 0.64). Additionally, there was a trend toward significance indicating that, after adjusting for the other factors in the model, those living greater than the median distance from the treatment center started ART at a slower rate than those at less than the median distance (HR = 0.69, 95% CI: 0.43 to 1.12, P = 0.134).

Figure 2
Figure 2
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While there was no significant difference in the initiation rate between males and females after adjusting for eligible CD4 count (HR = 0.88, 95% CI: 0.58 to 1.33, P = 0.534), there was a trend among females indicating that women who were using hormonal contraception at baseline were less likely to start ART (HR = 0.42, 95% CI: 0.17 to 1.07, P = 0.068) (Table 2). In a multivariate model including baseline hormonal contraceptive use, reported desire for additional children, and eligible CD4 count, women on hormonal contraceptives initiated ART significantly more slowly (HR = 0.39, 95% CI: 0.15 to 1.00), but there was no significant association between reporting a desire for additional children and time to ART initiation (HR = 0.79, 95% CI: 0.44 to 1.39, P = 0.409) (Fig. 3A).

Table 2
Table 2
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Figure 3
Figure 3
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Pregnancy Rates Before and After ART Initiation

We previously reported an overall pregnancy rate of 10.0 per 100 women-years, with a rate of 10.4 per 100 woman-years among HIV-1–infected women.14 To investigate the relationship between ART and the decision to become pregnant, we assessed the pregnancy rate before and after ART initiation (Fig. 3B). Based on a Cox proportional hazards model for the time from enrollment until first detected pregnancy, we included ART initiation as a time-varying covariate. We observed a pregnancy rate of 10.7 per 100 woman-years before ART initiation compared with a rate of 4.5 per 100 woman-years after initiation, with a nearly statistically significant association of lower pregnancy rates after ART initiation (HR = 0.43, 95% CI: 0.18 to 1.00, P = 0.051). When adjusted for age and baseline CD4 count, the hazard ratio was not significant, but the magnitude of the estimate did not change substantially (HR = 0.50, 95% CI: 0.20 to 1.24, P = 0.133), indicating minimal confounding by age or CD4 count. There was further evidence that women chose to avoid becoming pregnant after ART initiation. Among women who started ART during follow-up, women were 81% more likely to report being on hormonal contraception after starting ART compared with women not yet on ART (RR = 1.81, 95% CI: 1.02 to 3.19). The association was even stronger after adjusting for age and baseline self-reported desire for additional children (RR = 1.98, 95% CI: 1.04 to 3.77).

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DISCUSSION

We found delays in ART initiation among a cohort of discordant couples, despite regular CD4 testing, referrals to local treatment programs, counseling on the importance of ART, and free access to drugs. At 1 year after an eligible CD4 count, 36.6% of participants were still not on ART. We found that, not surprisingly, participants with lower CD4 counts initiated ART more quickly. These findings may predict future challenges to be faced as guidelines recommend starting ART at higher CD4 counts. Based on the results of this study, patients with higher CD4 counts may need additional counseling to emphasize the benefits of starting ART earlier.

Prompt initiation of ART is particularly important in discordant couples, where therapy benefits both the infected partner by delaying disease progression and the uninfected partner by reducing the risk of transmission. A couple-centered approach, in which the uninfected partner is involved in the decision to start ART and provides support once treatment is started, may be a productive strategy to accelerate ART initiation and improve treatment outcomes.

The strongest predictor of starting ART in this study was the CD4 count at the time of ART eligibility, with 56.3% of participants with an eligible CD4 count <100 on ART by 6 months after eligibility, compared with 42.6% of those with a CD4 count of 100 to 200 and 32.2% of those with a CD4 count of 200 to 250. A number of factors may be involved in patients with lower CD4 counts starting ART earlier. Those with lower CD4 counts are likely to be sicker, and therefore both the patient and the ART counselor are more likely to push for rapid treatment initiation. Similarly, patients with higher CD4 counts may believe that because they still feel well, they can delay starting ART. Patients may be concerned about side effects and other real or perceived implications of starting therapy and may therefore believe that it is best to delay therapy for as long as possible. Understanding these concerns will enable treatment counselors to provide better information to patients to maximize the benefits of ART while minimizing any potential negative effects. In locations with strict CD4 count thresholds for starting ART, small variations in measured CD4 count may result in an eligible CD4 count on one day but not on the next. Thus, patients with CD4 counts near the eligibility threshold are more likely to have an eligible CD4 count at a clinic visit but not at a subsequent visit when they are evaluated to start ART. In response to this natural variability, treatment centers may consider using CD4 counts from referring sources to judge eligibility rather than relying only on the CD4 count measured at the time of the evaluation visit. Additionally, the trend of raising the threshold for starting ART to higher CD4 counts should result in greater margins of error when determining treatment eligibility. The consequence of misclassifying a person with a CD4 count below but near a cutoff of 200 cells per microliter as ineligible to start ART is likely to have greater consequences than misclassifying a person below but near a cutoff of 350 cells per microliter. The likelihood of significant disease progression during the time until next CD4 count testing is far less in the latter scenario, assuming the patient remains linked to care.

Unlike previous studies, we did not find evidence that men started ART more slowly than women.9,10,15 Across many settings, men are more resistant to engaging with medical care and preventive services and tend to present for care later in the course of disease. The similarity in ART initiation rates between men and women in this study may be due to the nature of the study population. The discordant couples recruited in this study demonstrated a requisite willingness to engage with the health system by agreeing to participate in the study, and therefore may have selected for men that were more willing to seek care. We found that among the women, those on hormonal contraceptives may be less likely to start ART, and that after starting ART, women are less likely to become pregnant. We hypothesize that a number of factors may be involved in delaying ART in women. Concerns about the safety of ART during future pregnancies and potential interactions between contraceptive use and antiretroviral drugs, including the concern that ART could reduce the effectiveness of hormonal contraception, may discourage some women from starting ART.16 These barriers are of particular concern because they may represent important gaps in knowledge and potential targets for educational interventions to make women aware that being on ART can be safe during pregnancy and that the risk of both horizontal and vertical transmission is significantly reduced by ART.17 Additional behavioral research is needed to better understand the decision-making process among women surrounding reproductive desires and ART initiation.

Our findings that women are less likely to become pregnant after starting ART compared with those not yet on ART and that women on ART are more likely to report hormonal contraceptive use contradicts previous findings of increased fertility desire and higher pregnancy rates among women on ART.18–21 This difference may be explained, in part, by differences in the study populations and the duration of follow-up. A previous study of women recruited from an enhanced prevention of mother-to-child transmission program at 11 sites across sub-Saharan Africa reported pregnancy rates after an “index” pregnancy of 6.5 per 100 woman-years during the “pre-ART” period and 9.0 per 100 woman-years during the “on-ART” period compared with 10.7 and 4.5 per 100 woman-years, respectively, in our study population.21 The lower “pre-ART” pregnancy rate in the previous study may be due to the short time since last pregnancy. Additionally, women in our study were followed for less time after starting ART. It is possible that pregnancy rates are reduced for some period after starting ART, but that pregnancy rates increase after women have a chance to adjust to being on ART. There is clearly complexity in the relationship between reproductive desires, ART initiation, and pregnancy incidence. Management of women living with HIV should include access to family planning resources and a full discussion of the risks, benefits, and implications of being pregnant before, during, and after starting ART.

The treatment center to which study participants with an eligible CD4 count were referred is the US President's Emergency Plan for AIDS Relief–funded site that provides ART at no cost to the patient. Nevertheless, we found evidence of socioeconomic barriers to ART initiation. Even though there is no direct cost associated with ART, indirect costs such as transportation may pose a sufficient barrier to ART initiation despite eligibility and referral to a treatment center.22 This is supported by the findings in this study that, compared with homeowners, those paying higher rents started ART at a 48% slower rate and those paying lower rents started at a 71% slower rate. The additional finding of a trend indicating that those living further from the treatment center to which participants were referred started ART 31% more slowly than those living closer to the treatment center gives some support to the hypothesis that transportation barriers may interfere with prompt ART initiation. The potential indirect costs of ART, including transportation and lost time at work, should be considered when addressing barriers to ART initiation.

This study benefited from a relatively large sample size and extended period of follow-up; however, a number of limitations exist that may affect the generalizability of the findings. The study population was a research cohort of discordant couples in which the infected partner had disclosed their HIV status to their uninfected partner. Infected partners in this population may have more support than those that have not disclosed their status, leading to faster ART initiation, particularly among men that may be more resistant to seeking care. We relied on self-report to determine if and when participants started ART. In general, this is likely to underestimate the true initiation rate. Eligibility for ART was based on a CD4 count performed by the study. Because the treatment center to which study participants were referred used an independent CD4 count to assess eligibility, participants with a CD4 count near the eligibility threshold may not have had an eligible CD4 count when tested by the treatment center. Finally, this study cohort may not be directly comparable with the general population of HIV-1–infected persons in discordant relationships. The study participants agreed to 2 years of follow-up and received regular counseling on reducing transmission risk and the importance of starting ART. However, it is likely that this cohort would have a higher uptake of ART, and thus the delays in starting ART observed here may underestimate the true problem in the general population.

From these findings we conclude that even in locations where ART is accessible and available at low or no cost, there are delays in ART initiation after a patient meets the eligibility criteria. It is likely that a number of factors influence a person's decision to start ART, including direct and indirect costs of therapy, concerns about the sustainability of therapy, side-effects and drug interactions, and implications for family planning. The relative importance of these factors will vary between individuals and will depend to a large degree on the counseling and support that patients receive and the information they have available while making decisions about treatment. Additional behavioral research is needed to understand how these and others factors interact in the decision-making process surrounding ART initiation. A number of these factors represent potential gaps in knowledge and opportunities for interventions to address concerns and accelerate ART in patients. Accelerated treatment initiation will benefit both the health of the infected individual and their sexual partners through the decreased risk of sexual transmission.

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ACKNOWLEDGMENTS

We thank the couples who participated in the study and the clinical, laboratory, and data management personnel who made this research possible. We would also like to thank Sandy Emery for conducting the viral load assays.

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Cited By:

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Systematic Review of HIV Transmission between Heterosexual Serodiscordant Couples where the HIV-Positive Partner Is Fully Suppressed on Antiretroviral Therapy
Loutfy, MR; Wu, W; Letchumanan, M; Bondy, L; Antoniou, T; Margolese, S; Zhang, YM; Rueda, S; McGee, F; Peck, R; Binder, L; Allard, P; Rourke, SB; Rochon, PA
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Keywords:

antiretroviral; ART; HAART; HIV; discordant couples; serodiscordant

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© 2011 Lippincott Williams & Wilkins, Inc.

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