1. Department of Obstetrics and GynecologyState Specialist Hospital Akure Nigeria
2. Department of Obstetrics and GynecologyObafemi Awolowo University Teaching Hospital Complex Ilesha Nigeria
3. Department of Obstetrics and GynecologyObafemi Awolowo University Ile‐Ife Nigeria
4. Department of Obstetrics and GynecologyCollege of MedicineUniversity of Ibadan Ibadan Nigeria
5. Department of Obstetrics and GynecologyLagos State University College of Medicine Ikeja, Lagos Nigeria
6. Institute for Population and Social Research Salaya, Bangkok Thailand
7. UNDP‐UNFPA‐UNICEF‐WHO‐World Bank Special Programme of ResearchDevelopment and Research Training in Human Reproduction (HRP)WHO Geneva Switzerland