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Preclinical Pharmacology

Mechanisms of the Immunological Effects of Volatile Anesthetics: A Review

Yuki, Koichi MD*†; Eckenhoff, Roderic G. MD

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doi: 10.1213/ANE.0000000000001403
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Volatile anesthetics (VAs) have been popular drugs of choice to provide general anesthesia. These promiscuous, small molecules presumably interact with several receptors in the central nervous system (CNS) for anesthetic effect,1 and it is increasingly recognized that VAs also can target receptors outside the CNS, including those in our immune system. The studies of anesthetic effects on the immune system were already published about a century ago. Gaylord and Simpson2 reported that transplanted mammary carcinoma grew more rapidly under ether or chloroform anesthesia in mice, and Graham3 reported that ether significantly inhibited leukocyte phagocytosis of streptococci. Although these studies were not followed up for a long time, now there is a growing interest in a potential association between the choice of anesthetics and patients’ immunological outcomes. Our aim is to review potential VA targets on immune cells, suggest a model of VA effects on immune cells, and describe clinical implications.


Canonical VA Targets

Most canonical VA targets found in the CNS are ion channels, and some are expressed on leukocytes as well. Ions clearly play critical roles in leukocytes as in neurons. Divalent cations such as Ca2+ and Mg2+ act as secondary messengers for intracellular signaling, and monovalent cations (Na+, K+, and Cl) regulate the membrane potential and indirectly control Ca2+ influx.

GABAA Receptor

Table 1.
Table 1.:
Expression Profiles of GABAA Receptor Subunits in Human/Rodent Leukocytes

γ-Aminobutyric acid type A (GABAA) receptors are GABA-gated chloride channels and are considered important receptors underlying anesthesia.4–7 They are pentamers assembled from 19 subunits (α1–6, β1–3, γ1–3, δ, ε etc) with a typical stoichiometry (α)2-(β)2-γ (or δ, ε). α1–5 and β3 are sensitive to VAs.8–15 The subunit distribution in leukocytes is shown in Table 1.16–19 GABA inhibits T-cell proliferation and T cell-mediated delayed-type hypersensitivity response20,21 and attenuates monocyte chemotaxis and phagocytosis.18 GABA enhances Cl influx, producing hyperpolarization and an attenuation of Ca2+ influx. We suggest that GABA acts as a negative regulator in monocytes or lymphocytes via GABAA receptors, an action that should be further potentiated by VAs.

Glycine Receptors

Table 2.
Table 2.:
Expression Profiles of Glycine Receptor Subunits in Rodent Leukocytes

Glycine receptor (GlyR) is a pentameric glycine-gated chloride channel, assembled from α-subunits (α1–4) and/or β-subunit.22,23 Like GABAAR, receptors containing α1 and α2 are potentiated by VAs.24,25 GlyRs are expressed in macrophages and neutrophils (Table 2).26 Glycine enhances Cl influx, hyperpolarizes and attenuates Ca2+ influx, and blunts superoxide production in stimulated neutrophils.27 Glycine attenuates the activation of lipopolysaccharide (LPS)-treated monocytes28 and alveolar macrophages.29 We suggest that glycine works as a negative regulator via GlyRs in neutrophils and monocytes/macrophages, an effect that should be potentiated by VAs.

Nicotinic Acetylcholine Receptors

Table 3.
Table 3.:
Expression Profiles of nAChRs in Rodent Leukocytes

Nicotinic acetylcholine receptors (nAChRs) are pentameric nonselective cation channels, assembled from 16 subunits (α1–7, α9–10, β2–4, γ, δ, and ε).30 The α4β2 receptor is expressed in macrophages, and its activation enhances macrophage phagocytosis.31,32 α4β2 is also expressed in immature B cells.33 The α7 homomer is expressed in alveolar macrophages and contributes to the reduction of proinflammatory cytokines upon its activation.30,34 α4β2 is inhibited by VAs, whereas α7 is insensitive.35–38 We suggest that acetylcholine is a positive regulator of macrophage function via α4β2, which VAs can attenuate. Although a majority of B cells mediate acquired immunity with a half-life on the order of weeks,39 some B cells have innate functions,40 which VAs may influence in unclear ways (Table 3).

Serotonin Receptors

Table 4.
Table 4.:
Expression Profiles of 5-HT Subtypes in Human and Rodent Leukocytes

The expression profile of serotonin receptors (5-HTs) in leukocytes is shown in Table 4.41,42 Serotonin enhances macrophage phagocytosis via 5-HT1A.43 5-HT1B, 5-HT1E, and 5-HT2B induce chemotaxis of immature dendritic cells,41 whereas 5-HT4 and 5-HT7 in mature dendritic cells reduce Th1 cytokine release. Serotonin also induces migration of mast cells and eosinophils and is involved in T-cell proliferation. In general, VAs attenuate 5-HT1A, 5-HT2B, and 5-HT7 activity.44 We suggest that serotonin functions as a positive regulator via 5-HTs in macrophages, dendritic cells, eosinophils, and T cells, an effect that may be attenuated by VAs.

N-Methyl-d-Aspartate Receptor

Table 5.
Table 5.:
Expression Profiles of N-Methyl-d-Aspartate Receptor Subunits in Human and Rodent Leukocytes

The N-methyl-d-aspartate (NMDA) receptor is an ionotropic glutamate receptor.45 This ligand-gated nonselective cation channel is considered to be a prime VA target, assembled from NR1, NR2 (NR2A-D), and NR3.46–48 NR1 and NR2B subunits are present in resting T cells, and NR1, NR2A, NR2B, and NR2D subunits are detected in phytohemagglutinin-activated T cells.47 The inhibition of NMDA receptors impairs T-cell proliferation.49 Zymosan-activated neutrophils express NR1/NR2B, which may be involved in reactive oxygen species production. VAs inhibit NR1/NR2A and NR1/NR2B.50,51 We suggest that NMDA receptors act as positive regulators in neutrophils and T cells, an effect that VAs may attenuate (Table 5).

Potassium Channel

Potassium channels are classified into at least 4 types; calcium-activated channels (Kca), voltage-gated channels (Kv), inward rectifying channels, and tandem pore domain channels (K2P). Kv and Kca channels are major potassium channels in leukocytes. The K2P channel is also expressed in leukocytes and has been increasingly recognized as a prime VA target.52 Because VAs affect inward rectifying channels minimally,53 we will not review them here.

Kca 3.1 and Kv1.3 are major potassium channels in T and natural killer (NK) cells54–56 and are also expressed in macrophages54 and neutrophils.57 VAs inhibit Kca3.1 but potentiate Kv3.1.58,59 Among the members of K2P channel, TASK-1, -2, and -3 are expressed in T cells,59,60 and TASK-2 is expressed in NK cells.55 Activation of K2P channel hyperpolarizes the cell and reduces activation. TASK-1, -2, and -3 are potentiated by VAs.61–65 The role of potassium channels has been studied most in T cells.59 Kca3.1, Kv1.3, and K2P channels counterbalance calcium-induced depolarization of the plasma membrane to allow more Ca2+ influx into T cells. The divided contribution of a K+ outward current in human CD3+ T cells is 40% through Kv1.3, 20% through Kca1.3, and 40% through K2P channels. VAs may potentiate the K+ efflux via their interaction with Kv1.3 and K2P channels and reduce it via Kca3.1. Overall, the plasma membrane potential of neutrophils, macrophages, and T cells is regulated by potassium channels, an effect that VAs can alter in a heterogeneous manner.

Sodium Channel

Among voltage-gated sodium channels (Nav), Nav1.2, Nav1.4, Nav1.5, Nav1.6, and Nav1.8 are sensitive to VAs.66 Nav1.5 is expressed in the late endosome of macrophage and regulates phagocytosis.67,68 This channel is also essential for the positive selection of CD4+ T cells.69 We suggest that VAs attenuate the activation of macrophage phagocytic function via Nav1.5, but positive selection is a long-term process, which might not be influenced by short exposure to VAs.

Noncanonical Target: β2 Integrin

Previously, we demonstrated that 2% isoflurane exposure for 2 and 4 hours reduced neutrophil migration by 85% to 90% in the reverse Arthus reaction model, a well-known skin inflammation model.70 Although many molecules are involved in neutrophil recruitment, the β2 integrins are essential, because their depletion completely abolished neutrophil migration. In addition, the ex vivo study by Möbert et al,71 showing that neutrophils exposed to isoflurane or sevoflurane had reduced adhesion to human umbilical vein endothelial cells, provided a rationale for a closer study of the β2 integrins.

Integrins are adhesion molecules consisting of α- and β-subunits (18 α- and 8 β-subunits) (Figure 1A).72 β2 integrins are expressed only in leukocytes, and thus are also called “leukocyte integrins” and include αLβ2 (a.k.a., LFA-1), αMβ2 (a.k.a., Mac-1), αXβ2, and αDβ2. LFA-1 is expressed in all leukocytes and facilitates leukocyte arrest, as well as immunological synapse formation on NK, T, and B cells. Mac-1 is largely expressed on neutrophils, monocytes, and macrophages and underlies intravascular “crawling” on the endothelium and complement-mediated phagocytosis. The in vivo role of αXβ2 and αDβ2 is still unclear. The molecules responsible for leukocyte recruitment in different tissues and pathophysiologic states are likely different,73 nevertheless, a requirement for LFA-1 and Mac-1 well described and important in leukocyte adhesion deficiency.

Figure 1.
Figure 1.:
The conformational changes of β2 integrins with inside-out signal. A, With activation, the conformation of β2 integrins changes from a bent conformation (left) to an extended conformation (right). β2 integrins can bind to their ligands only when they are fully activated. α indicates α-subunit; β, β-subunit. The blue arrow shows the downward displacement of C terminus in the α I domain. B, The scheme of inside-out signal, β2 activation, and subsequent ligand binding.
Figure 2.
Figure 2.:
The concerted effects of volatile anesthetics on target receptors in neutrophils. Signals via cytokine and/or chemokine receptors increase intracellular calcium concentration and activate β2 integrins. Intracellular calcium influx can be enhanced by the N-methyl-d-aspartate (NMDA) receptor, voltage-gated potassium channel (Kv), and calcium-activated potassium channel (Kca) and attenuated by the glycine receptor (GlyR). The effect of volatile anesthetics on these targets is summarized. The subtypes of Kv and Kca channels are not known and need to be studied, as well as the effect of volatile anesthetics.

The major ligand-binding domain (called the α I domain) for β2 integrins is located in the α-subunit.72,74 Integrins undergo dynamic conformational changes, which include the α I domain upon activation (Figure 1A). With extracellular activation of leukocytes, LFA-1 and Mac-1 become active (inside-out signal) (Figure 1B) and then bind to their ligands. This involves the pull-down and unwinding of the α7 helix of the α I domain (“extended conformation”) and conformational rearrangements of the ligand-binding site at the α I domain from a low- to a high-affinity configuration, only the latter of which can tightly bind to ligands (Figure 2). The LFA-1 antagonist lovastatin works by binding to the pocket underneath this α7 helix, impairing ligand binding. Isoflurane and sevoflurane also bind to this “lovastatin site”75–77 and inhibit LFA-1. Mac-1, which is structurally similar to LFA-1, was inhibited by isoflurane but not by sevoflurane.75 We suggest that VAs modulate neutrophil and macrophage recruitment via LFA-1 and/or Mac-1, and phagocytosis via Mac-1, and T cell and B cell recruitment via LFA-1.


Describing the effect of VAs on individual targets in leukocytes does not provide a complete understanding of how VAs affect their function. Bridging the gap between molecular and cellular effects requires an appreciation of how these proteins are integrated within the cell. Although additional VA targets in leukocytes may exist, it is nonetheless important to construct a model of how VAs affect the regulation of leukocyte function. VA target receptors in leukocytes are summarized in Table 6, and here, we review neutrophils, macrophages, and NK cells as examples.

Table 6.
Table 6.:
Possible VA Target Receptors on Leukocytes


Circulating neutrophils are rapidly primed to extravasate and migrate toward a site of inflammation/infection. During surgery, the time frame of neutrophil recruitment overlaps with the exposure to VAs, making neutrophils prime targets for VA-mediated immunological effects.

Neutrophil recruitment consists of rolling, adhesion, and transmigration. These events are triggered by chemoattractants and inflammatory mediators, which activate neutrophils (inside-out signal) (Figure 1B). The many molecules responsible for neutrophil recruitment have been reviewed elsewhere in detail.73,78 In general, activated neutrophils attach and roll along the endothelium via the selectins (E- and P-selectins on the endothelium and L-selectin on neutrophils). Later, firm adhesion on the endothelium is mediated by the β2 integrins, principally LFA-1 and Mac-1.79 Finally, neutrophils transmigrate through the endothelium to the site of inflammation/infection to mediate a complex array of antibacterial effects, including phagocytosis, generation of toxic reactive oxygen species, secretion of proteases and antimicrobial peptides, neutrophil extracellular traps, as well as mediators that attract additional neutrophils, and macrophages and lymphocytes. The antibacterial products of neutrophils are also responsible for inflammation and tissue destruction encountered during recovery from bacterial infection, sepsis, and ischemia/reperfusion injury.80,81 Phagocytosis of foreign particles/organisms is mediated by complement receptors (such as Mac-1) and Fcγ receptors.82–84

VAs target LFA-1, Mac-1, GlyR, Kv, and Kca channels and NMDA receptors in neutrophils (Table 6). Intracellular calcium serves as a secondary messenger to activate neutrophils, and its concentration is a sensitive indicator of activation.85,86 Intracellular calcium regulates and directly activates β2 integrins (inside-out signal).85 NMDA receptors may enhance intracellular calcium signaling. Potassium efflux via Kv and Kca channels may counterbalance Ca2+ influx, sustaining the resting membrane potential and further enhancing Ca2+ influx as in T cells. The role of Cl efflux is more clearly understood. Resting neutrophils have an atypically high, intracellular Cl concentration (80–90 mM).87 Tumor necrosis factor (TNF)-α stimulation causes Cl efflux in neutrophils. The Cl inhibitor ethacrynic acid blocks continuous Cl efflux, cell spreading, and superoxide production in TNF-α-stimulated neutrophils. Furthermore, resuspension of neutrophils in Cl-free medium results in massive Cl efflux, Ca2+ influx, enhanced adhesion, and superoxide production, demonstrating that Cl efflux and Ca2+ influx themselves lead to neutrophil and β2 integrin activation.88 GlyR, however, enhances Cl influx. Cl influx hyperpolarizes the cell membrane, which presumably reduces Ca2+ influx27 and the likelihood of neutrophil activation. Figure 2 summarizes the potential effects of VAs on neutrophils.


Macrophages are considered a “professional” phagocyte. Monocytes circulate through bone marrow and extravasate to tissues and differentiate into macrophages.89 Macrophages can be divided into different subsets based on their molecular expression profiles; “classically” activated macrophages are M1 macrophages and “alternatively” activated macrophages are M2 macrophages. M1 macrophages can be induced by interferon-γ and LPS stimulation in vitro, and they mediate host defense with high microbicidal activity, whereas M2 macrophages are induced by interleukin (IL)-4 and IL-13 in vitro and mediate antiinflammatory effect and phagocytosis and help tissue healing.90

Figure 3.
Figure 3.:
The targets of volatile anesthetics in macrophages and their biological roles. Volatile anesthetic target receptors and ion channels in macrophages are shown. ER indicates endoplasmic reticulum; GABA, γ-aminobutyric acid; IL, interleukin; TNF, tumor necrosis factor.

The GlyR, GABAA-receptor, nAChR, 5-HT1A, LFA-1, Mac-1, Kca3.1, Kv1.3, and Nav1.5 are all VA targets on macrophages/monocytes. GlyR allows Cl influx and hyperpolarizes the membrane, inhibiting a rise in intracellular calcium, superoxide, and TNF-α secretion.26,29 Activation of the GABAAR reduced IL-6 and IL-12 production in LPS-stimulated macrophages,91 whereas stimulation of nAChR α4β2 with agonists attenuated intracellular calcium and NF-kB activation32 but enhanced phagocytosis.31 Both Kca3.1 and Kv1.3 regulate calcium influx,92 and their blockade reduced chemotactic migration.93,94 Nav1.5 is expressed on the late endosome and contributes to the generation of prolonged and localized calcium oscillations during phagosome formation.67 The activation of 5-HT1A enhances phagocytosis.95 The interactions among these ion channels and receptors have not been much studied in macrophages, but the final effect is unlikely to be a simple sum of the individual actions. We summarized the interactions of VAs on target receptors in macrophages in Figure 3.

NK Cells

Figure 4.
Figure 4.:
The targets of volatile anesthetics on natural killer cells and their biological roles. Once natural killer (NK) cells bind to target cells (conjugation), they polarize and degranulate granzyme, perforin, and FAS ligand to produce target cell cytotoxicity. LFA-1 is critical for adhesion to target cells (conjugation), and TASK-2 is also involved in LFA-1-dependent adhesion, as well as degranulation. Kca3.1 and Kv1.3 channels are involved in degranulation.

NK cells are a phenotypically distinct population of cytotoxic lymphocytes that are critical for innate immunity. They express a number of activating and inhibitory receptors and can respond to a variety of target cells, including viral infected cells and tumor cells, and lyse them without prior immunization.96 The decision to lyse target cells is determined by a delicately balanced input to NK cells from these activating and inhibitory receptors. LFA-1 is one of the critical activating receptors on NK cells involved in binding to target cells (conjugation) and providing signals to lyse target cells.97 The binding of LFA-1 to intercellular adhesion molecule-1 reorganizes cytoskeletal structures within NK cells and causes degranulation and cell lysis.98 An elevation of intracellular calcium is a requisite step for this killing process.99 Potassium channels counterbalance the depolarization induced by a rise of intracellular calcium level55 and have been shown to be involved in the adhesion of NK cells to target cells, as well as cytotoxicity.100 LFA-1, Kca3.1, Kv3.1, and TASK-2 are all receptors that VAs can target in NK cells. Among them, LFA-1 and TASK-2 are both involved in LFA-1-dependent adhesion to target cells.55 A TASK-2 antagonist attenuated calcium influx, preventing depolarization and the release of lytic granules. Similarly, blockade of Kv1.3 reduced calcium influx,55 and thereby NK cell degranulation.56 However, Kca1.3 blockade enhanced the NK degranulation but did not affect attachment to target cells.56 The summary is in Figure 4, demonstrating the various potential effects of VAs on NK cell functions.

Clinical Considerations in the Perioperative Periods

Our body has multilayered defense mechanisms against the outside world. Skin and mucosa are the most exposed tissues and act as the first line of defense against various organisms. Surgical procedures usually disrupt these barriers and introduce various organisms to otherwise sterile sites. Also tissue injury itself triggers acute inflammation (“sterile inflammation”). Adequate recruitment of circulating leukocytes to the site is critical for cleaning the site and promoting wound healing. In addition, some surgical procedures involve more extreme forms of pathophysiology such as ischemia-reperfusion. During tumor resection, immune cells may have to keep fighting to eradicate disseminated tumor cells. The role of VAs in these circumstances is briefly reviewed.

Ischemia-Reperfusion Injury

Ischemia-reperfusion is a common experience in many surgical procedures (eg, Pringle maneuver, unclamping of cross-clamped arteries, reestablishment of blood flow during transplantation) or after relief of vascular obstruction (eg, relieving malrotation of guts, embolectomy). This is considered an extreme example of sterile inflammation. Among immune cells, neutrophil recruitment plays a central role in the pathogenesis,101,102 and the activation of β2 integrins is critical. The benefit of VAs in ischemia-reperfusion has been shown in various organs and tissues including kidney,103 lung,104 and coronary artery/ myocardium in animal models.102,105 In a study using healthy human volunteers, sevoflurane (even at 0.5%–1%) protected forearm ischemia-reperfusion injury via an attenuation of neutrophil activation.106 The benefit of VAs in clinical settings is also reported in cardiac surgery.107 These results, while sparse, support a role for VAs in mitigating sterile inflammation.

Tumor Immunology

Although surgical resection is considered a gold standard of solid tumor management, recurrence or metastasis remains the major cause of death.108 The postulated, underlying mechanisms include the mechanical dissemination of tumor cells intraoperatively and promotion of local and distal metastasis by attenuation of cell-mediated immunity.109 A growing literature suggests that the type of anesthesia/anesthetics is associated with the frequency of tumor recurrence or metastasis. In general, less general anesthesia is associated with less recurrence or metastasis, or better outcomes110–114 and these studies were previously reviewed in detail.115 A recent retrospective study showed that patients receiving VAs for their surgery were associated with a hazard ratio of 1.59 for death on the univariate analysis and 1.46 after the multivariate analysis compared with the patients receiving total IV anesthesia, suggesting that VAs may not be beneficial in tumor surgery.116 Perioperative NK cell suppression correlates with higher recurrence and mortality in patients.117,118 As stated earlier, VAs should impair NK conjugation and degranulation via inhibiting LFA-1 and TASK-2. However, VAs could enhance degranulation through their interaction with Kca3.1 and Kv1.3. Given that conjugation precedes degranulation, VAs presumably impair NK cell cytotoxicity, but further study is warranted to confirm these provocative findings.


Perioperative infection is one of the most common perioperative complications. Von Dossow et al119 examined alcoholic patients who underwent resection of upper gastrointestinal tract under general anesthesia either with propofol or isoflurane. Postoperative infection rate was lower in the propofol group (23%) than in the isoflurane group (67%). Chang et al120 studied the incidence of surgical site infection in patients who underwent orthopedic procedures under regional anesthesia (spinal or epidural anesthesia) or general anesthesia and found that the general anesthesia arm had a higher incidence of surgical site infection (2.8%) over the regional anesthesia arm (1.2%). Although the detailed information of the general anesthetics was not reported, VAs would presumably be the major anesthetics in their general anesthesia group. Leukocyte recruitment and subsequent killing of microbes are required to minimize perioperative infection. Several animal studies have demonstrated that VAs modify leukocyte adhesion and recruitment.71,105,121–126 The number of recruited leukocytes to tissues is determined by a balance between proinflammatory signals and antiinflammatory signals (resolution). The intravital microscopic experiment of mesenteric circulation in LPS-induced inflammation showed that isoflurane exposure increased the speed of leukocyte rolling,122 which could lead to impaired adhesion and transmigration. Our study using the reverse Arthus reaction model in mice showed impaired neutrophil migration by isoflurane.70 Although the proinflammatory mediators in these models recruit leukocytes, resolution agonists such as lipoxins and resolvins limit further recruitment,127 but the effect of VAs on resolution agonists was not reported.126 The role of VAs on bacterial killing has also been studied. Ex vivo studies in patients (ASA physical status I–III) undergoing abdominal surgery showed a reduction of granulocyte phagocytosis and oxidative burst after 1 hour of sevoflurane or xenon anesthesia.128 Also in an ex vivo study using patients who underwent orthopedic procedures, a time-dependent reduction of phagocytic function and bacterial killing was reported to occur under isoflurane anesthesia.129

Postoperative Cognitive Dysfunction

Change in personality or cognitive ability after surgery is considered a significant form of morbidity. The causes are likely multifactorial, including a host of preoperative comorbidities, and inflammation, stress, and infection resulting from surgery and anesthesia. TNF-α and its downstream mediator IL-1β play a role in cognitive dysfunction in animal models.130,131 Cognitive dysfunction produced by TNF-α/IL-1β in mice occurred via the α5GABAA receptor. Activation of this receptor appears to impair memory and IL-1β-induced prolonged α5GABAA receptor expression.132 Furthermore, isoflurane caused a persistent tonic current via α5GABAA receptor.133

Microglia, which are analogous to macrophages in the brain, secrete a variety of proinflammatory mediators, so attenuating this neuroinflammation may help to reduce postoperative memory and perhaps cognitive deficits. In a study of isolated microglia, isoflurane had little effect on LPS-stimulated proinflammatory cytokine release, while sevoflurane enhanced it.134 In patients undergoing esophageal tumor resection under sevoflurane anesthesia or propofol anesthesia, cognitive decline was more apparent in the sevoflurane anesthesia group and was associated with higher plasma IL-6 and TNF-α concentrations. Finally, in a rare randomized controlled study of older patients getting spinal surgery, and with mild preexisting cognitive deficits, those receiving sevoflurane anesthesia declined more rapidly compared with regional or propofol.135 These studies suggest that VAs may contribute to postoperative cognitive decline, but it is becoming clear that many other factors are involved.


Although clinical studies on the association between VAs and immunological issues are limited, this review highlights a molecular biological basis of VA-induced immunomodulation and hopefully facilitates clinical studies on perioperative immunological outcomes in the future.


Name: Koichi Yuki, MD.

Contribution: This author helped design and prepare the manuscript.

Name: Roderic G. Eckenhoff, MD.

Contribution: This author helped design and prepare the manuscript.

This manuscript was handled by: Markus W. Hollmann, MD, PhD.


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