1. Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
2. Health Services and Outcomes Research, Children’s Mercy Hospital, Kansas City, MO, USA
3. Faculté de Medecine et d’OdontoStomatologie, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako, Mali
4. Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA