[1] Montefiore Med Ctr, Albert Einstein Coll Med, Dept Obstet & Gynecol, Bronx, NY 10467 USA
[2] Montefiore Med Ctr, Albert Einstein Coll Med, Dept Womens Hlth, Bronx, NY 10467 USA
[3] Montefiore Med Ctr, Albert Einstein Coll Med, Dept Epidemiol & Populat Hlth, Bronx, NY 10467 USA