Africa Health Research Institute, Universite Paris Descartes, University of Southampton - School of Primary Care, Population Sciences and Medical Education, Africa Health Research Institute, University of Bordeaux, University of Bordeaux - Bordeaux Population Health Research Center, University of KwaZulu-Natal, Harvard University - Department of Population and International HealthUniversity of KwaZulu-Natal, University of Bordeaux, Africa Health Research Institute, University of Bordeaux and Independent