Affiliation: | aDepartment of Obstetrics and Gynecology, Duke Global Health Institute, Duke University, Durham, North Carolina bDepartment of Epidemiology, School of Public Health cCenter for Global Health and Development, Boston University, Boston, Massachusetts, USA dHealth Economics and Epidemiology Research Office eFaculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa fDepartment of Epidemiology, University of North Carolina, Chapel Hill, North Carolina, USA. |