1. International Centre for Reproductive Health; Ghent University; Ghent; Belgium
2. Centre de Recherche en Santé de Nouna; Nouna; Burkina Faso
3. Navrongo Health Research Centre; Navrongo; Ghana
4. Muhimbili University of Health and Allied Sciences; School of Public Health and Social Sciences; Dar Es Salaam; Tanzania
5. Department of Public Health; University of Heidelberg; Heidelberg; Germany