1. Department of International Health, Johns Hopkins Bloomberg School of Public Health, 615 N. Wolfe Street, Baltimore, MD 21205, USA
2. Department of Population, Family and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, 615 N. Wolfe Street, Baltimore, MD 21205, USA
3. International Centre for Reproductive Health Kenya, Nairobi, Kenya
4. Institut Supérieur des Sciences de la Population (ISSP) of the Joseph Ki-Zerbo University, Ouagadougou, Burkina Faso
5. Department of Community Medicine, University of Ibadan, Ibadan, Nigeria
6. Centre for Research, Evaluation Resources and Development, Ife, Nigeria
7. IIHMR University, Jaipur, India
8. Ecole de Santé Publique de l'Université de Kinshasa, Kinshasa, Democratic Republic of Congo