[1] NICHD, Perinatol Res Branch, Intramural Div, NIH,DHHS,Hutzel Womens Hospital, Detroit, MI 48201 USA
[2] NICHD, Perinatol Res Branch, Intramural Div, NIH,DHHS,Hutzel Womens Hospital, Bethesda, MD USA
[3] Wayne State Univ, Dept Obstet & Gynecol, Hutzel Womens Hosp, Detroit, MI USA
[4] Wayne State Univ, Ctr Mol Med & Genet, Detroit, MI USA
[5] Pontificia Univ Catolica Chile, Hosp Sotero Rio, Ctr Perinatal Diag & Res CEDIP, Puente Alto, Chile
[6] Univ Hawaii, John A Burns Sch Med, Dept Obstet Gynecol & Womens Hlth, Honolulu, HI 96822 USA