[1] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Populat Family & Reprod Hlth, 615 N Wolfe St, Baltimore, MD 21205 USA
[2] World Hlth Org, UNDP UNFPA UNICEF WHO World Bank Special Programm, Dev & Res Training Human Reprod HRP, Dept Reprod Hlth & Res, Geneva, Switzerland
[3] Univ Ibadan, Coll Med, Natl Inst Maternal & Child Hlth, Dept Obstet & Gynaecol, Ibadan, Nigeria
[4] Univ Ibadan, Fac Publ Hlth, Dept Hlth Promot & Educ, Coll Med, Ibadan, Nigeria
[5] Univ Ibadan, Fac Social Sci, Dept Sociol, Ibadan, Nigeria
[6] Nyanya Gen Hosp, Abuja, Federal Capital, Nigeria
[7] Maitama Dist Hosp, Abuja, Federal Capital, Nigeria