1. Department of Obstetrics and Gynecology; University of Benin; Benin City; Nigeria
2. Department of Obstetrics and Gynecology; University of Port Harcourt; Port Harcourt; Nigeria
3. Department of Obstetrics and Gynecology; Lagos State University Teaching Hospital; Ikeja; Nigeria
4. Department of Obstetrics and Gynecology; University of Jos; Jos; Nigeria
5. Department of Obstetrics and Gynecology; University of Maiduguri Teaching Hospital; Maiduguri; Nigeria
6. Department of Obstetrics and Gynecology; University of Calabar Teaching Hospital; Calabar; Nigeria
7. Department of Obstetrics and Gynecology; University of Nigeria Teaching Hospital; Enugu; Nigeria
8. Department of Obstetrics and Gynecology; Aminu Kano University Teaching Hospital; Kano; Nigeria
9. Sefa Specialist Hospital; Kaduna; Nigeria