[1] Univ Nigeria, Dept Obstet & Gynaecol, Nsukka, Enugu State, Nigeria
[2] Harvard TH Chan Sch Publ Hlth, Dept Global Hlth & Populat, Takemi Program Int Hlth, Boston, MA USA
[3] Univ Nigeria, Dept Sociol Anthropol, Nsukka, Enugu State, Nigeria
[4] Harvard Sch Publ Hlth, Dept Global Hlth & Populat, Takemi Program Int Hlth, Boston, MA USA
[5] Harvard TH Chan Sch Publ Hlth, Dept Social & Behav Sci, Boston, MA USA