[1] Univ Calabar, Teaching Hosp, Dept Obstet & Gynaecol, Calabar, Cross Rivers St, Nigeria
[2] Univ Uyo, Teaching Hosp, Dept Obstet & Gynaecol, Uyo, Nigeria
[3] Univ Benin, Teaching Hosp, Dept Obstet & Gynaecol, Benin, Nigeria
[4] Delta State Univ, Teaching Hosp, Dept Obstet & Gynaecol, Abraka, Nigeria
[5] Fed Med Ctr, Dept Obstet & Gynaecol, Yenagoa, Nigeria
[6] WHO, UNDP UNFPA UNICEF WHO World Bank Special Programm, Dept Reprod Hlth & Res, Geneva, Switzerland