1. School of Public Health, University of the Western Cape, Cape Town, South Africa
2. Department of Public Health, University Joseph Ki-Zerbo, Ouagadougou, Burkina Faso
3. Recherche pour la Santé et le Développement (RESADE), Ouagadougou, Burkina Faso
4. Heidelberg Institute of Global Health, Medical Faculty and University Hospital, Heidelberg University, Heidelberg, Germany
5. Institute of Tropical Medicine, Department of Public Health, Antwerp, Belgium