[1] Guttmacher Inst, New York, NY 10038 USA
[2] Kwame Nkrumah Univ Sci & Technol, Sch Publ Hlth, Dept Populat Family & Reprod Hlth, Kumasi, Ghana
[3] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Epidemiol, Baltimore, MD USA
[4] Kwame Nkrumah Univ Sci & Technol, Sch Publ Hlth, Dept Epidemiol & Biostat, Kumasi, Ghana
[5] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Populat Family & Reprod Hlth, Baltimore, MD USA