1. MRC/Wits Rural Public Health and Health Transitions Research UnitSchool of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
2. Institut de Recherche pour le Développement, UMI Résiliences, Bondy, France
3. Institut PasteurEpidémiologie des Maladies Emergentes, Paris, France
4. FERDI Université d'Auvergne, Clermont-Ferrand, France
5. INDEPTH NetworkAccra, Ghana
6. Umeå Centre for Global Health Research, Division of Epidemiology and Global Health, Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden