1 Department of Population, Family and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, 615 N Wolfe St, E4009, Baltimore, MD, 21205, USA. swood@jhu.edu.
2 Department of Population, Family and Reproductive Health, Bill & Melinda Gates Institute for Population and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, USA. swood@jhu.edu.
3 Department of Population, Family and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, 615 N Wolfe St, E4009, Baltimore, MD, 21205, USA.
4 Institut Superieur des Sciences de la Population (ISSP/University of Ouagadougou), Ouagadougou, Burkina Faso.
5 Ecole Nationale Superieure de Statistique et Appliquee d'Abidjan (ENSEA), Abidjan, Côte d'Ivoire.
6 Kinshasa School of Public Health, Kinshasa, Democratic Republic of Congo.
7 International Centre for Reproductive Health-Kenya, Nairobi, Kenya.
8 Technical University of Mombasa, Mombasa, Kenya.
9 Department of Public Health and Primary Care, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium.
10 Institut National de la Statistique du Niger, Niamey, Niger.
11 College of Medicine, University of Ibadan, Ibadan, Nigeria.
12 University of the Western Cape, Cape Town, South Africa.
13 Indian Institute of Health Management Research, Sanganer, Jaipur, India.
14 Makerere University School of Public Health, Kampala, Uganda.
15 Department of Population, Family and Reproductive Health, Bill & Melinda Gates Institute for Population and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, USA.
16 Johns Hopkins School of Nursing, Baltimore, USA.