1. MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt)School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
2. Centre for Global Health Research, Division of Epidemiology and Global Health, Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
3. INDEPTH Network Accra, Ghana
4. Department of SociologyPopulation Studies and Training Center, Brown University, Providence, RI, USA
5. Centre de recherche en démographie et sociétés, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
6. Brown University School of Public HealthInternational Health Institute, Brown University, Providence, RI, USA
7. Department of SociologyUniversity of Washington, Seattle, USA
8. Institute of Behavioral Science (IBS)University of Colorado at Boulder, Boulder, CO, USA