1. Population, Family and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
2. International Centre for Reproductive Health (ICRH), Faculty of Medicine and Health Sciences, Ghent, Belgium
3. African Population and Health Research Center, APHRC Campus, Nairobi, Kenya
4. Population and Reproductive Health Programme, College of Health Sciences, Obafemi Awolowo University, Osun State, Nigeria
5. Key Laboratory of Reproduction Regulation of NPFPC, SIPPR, IRD, Fudan University, Shanghai, China
6. Public Health and Community Medicine Department, Assiut University, Assiut, Egypt