[1] Univ Ghana, Sch Publ Hlth, Dept Populat Family & Reprod Hlth, Legon, Ghana
[2] Royal Cornwall Hosp Trust, Dept Obstet & Gynecol, Truro, England
[3] Univ Philippines, Philippine Gen Hosp, St Lukes Med Ctr Global City, Dept Obstet & Gynecol, Quezon City 1101, Philippines
[4] Univ Uruguay, Sch Med, Dept Obstet & Gynecol, Montevideo, Uruguay