[1] Aga Khan Univ, Dept Community Hlth Sci, Karachi, Pakistan
[2] Univ Texas Austin, Populat Res Ctr, Austin, TX 78712 USA
[3] African Populat & Hlth Res Ctr APHRC, Nairobi, Kenya
[4] Univ Ghana, Dept Populat Family & Reprod Hlth, Accra, Ghana
[5] World Hlth Org, Dept Sexual & Reprod Hlth & Res, UNDP UNFPA UNICEF World Bank Special Program Res, Dev & Res Training Human Reprod HRP, Geneva, Switzerland