[1] Univ Hawaii, John A Burns Sch Med, Dept Obstet Gynecol & Womens Hlth, 1319 Punahou St,Ste 824, Honolulu, HI 96826 USA
[2] Univ Hawaii, John A Burns Sch Med, 651 Ilalo St, Honolulu, HI 96813 USA
[3] WHO, Maternal & Perinatal Hlth & Preventing Unsafe Abo, Ave Appia 20, CH-1211 Geneva 27, Switzerland