1. Department of Obstetrics and Gynaecology, University of Medical Sciences Teaching Hospital, Nigeria, Ondo
2. Population Council Nigeria, Abuja, Nigeria
3. Julius Global Health, Julius Center for Health Science and Primary Care, UMC Utrecht, Utrecht University, Utrecht, The Netherlands
4. Department of Obstetrics and Gynaecology, Federal Teaching Hospital, Abakaliki, Nigeria
5. Department of Obstetrics and Gynaecology, Abubakar Tafawa Balewa University Teaching Hospital, Nigeria, Bauchi
6. Institute of Human Virology, Abuja, Nigeria
7. Department of Obstetrics and Gynaecolgy, Mother and Child Hospital, Akure, Nigeria
8. Department of Obstetrics and Gynaecology, University of Calabar Teaching Hospital, Calabar, Nigeria
9. Department of Obstetrics and Gynaecology, Usmanu DanFodio University Teaching Hospital, Sokoto, Nigeria
10. Department of Obstetrics and Gynaecology, Bayero University/Aminu Kano Teaching Hospital Kano, Kano, Nigeria
11. Population Council, Population Council, Washington, DC, USA
12. Department of Obstetrics and Gynaecology, Muhammad Abdullahi Wase Teaching Hospital, Kano, Nigeria
13. Department of Obstetrics and Gynaecology, Federal Medical Center, Lokoja, Nigeria
14. Department of Obstetrics and Gynaecology, Erasmus Medical Center, University Medical Center, Rotterdam, The Netherlands