1 MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), University of the Witwatersrand, Faculty of Health Sciences, Johannesburg, South Africa.
2 Harvard Center for Population and Development Studies, Harvard University, Cambridge, MA, USA.
3 INDEPTH Network, East Legon, Accra, Ghana.
4 Centre for Global Health Research, Umeå University, Umeå, Sweden.
5 Department of Population Health, London School of Hygiene and Tropical Medicine, London, UK.
6 Africa Centre for Health and Population Studies, University of KwaZulu-Natal, Mtubatuba, South Africa.
7 Department of Global Health and Population.
8 Division of Cardiovascular Medicine, Brigham and Women's Hospital, Boston, MA, USA.
9 Harvard Medical School, Harvard University, Boston, MA, USA.
10 Departments of Social and Behavioral Sciences and Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA.