1. Effective Care Research Unit; Department of Obstetrics and Gynecology; Nnamdi Azikiwe University; Nnewi Nigeria
2. Department of Obstetrics and Gynecology; Nnamdi Azikiwe University Teaching Hospital; Nnewi Nigeria
3. Department of Obstetrics and Gynaecology; University of Nigeria Teaching Hospital; Enugu Enugu State Nigeria
4. Department of Obstetrics and Gynecology; Chukwuemeka Odumegwu Ojukwu University Teaching Hospital; Awka Nigeria
5. Department of Obstetrics and Gynecology; Federal Medical Center; Umuahia Nigeria
6. Department of Obstetrics and Gynecology; ESUT Teaching Hospital; Enugu Nigeria
7. Division of Maternal Fetal Medicine, Department of Gynecology and Obstetrics; John Hopkins University School of Medicine; Baltimore MD USA