University of Göttingen - Centre for Modern Indian Studies, University of the Witwatersrand - South African Medical Research Council, Harvard University - Center for Population and Development Studies, Harvard University - Center for Population and Development Studies, University of Göttingen - Centre for Modern Indian Studies, University of the Witwatersrand - South African Medical Research Council, Harvard University - Center for Population and Development Studies, University of the Witwatersrand - MRC/Wits Rural Public Health and Health Transitions Research Unit, University of the Witwatersrand - MRC/Wits Rural Public Health and Health Transitions Research Unit, Harvard University - Center for Population and Development Studies and Heidelberg University - Heidelberg Institute of Global Health