*Department of Medical Ethics and Health Policy, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
†Center for Health Incentives and Behavioral Economics, Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia, PA
‡RTI International, Durham, NC
§Impact Research and Development Organization, Kisumu, Kenya
The study was funded by the International Initiative for Impact Evaluation (TW2-02-02).
The authors have no funding or conflicts of interest to disclose.
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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Received September 28, 2017
Accepted February 09, 2018