[1] Beth Israel Deaconess Med Ctr, Dept Obstet & Gynecol, Boston, MA 02215 USA
[2] Brigham & Womens Hosp, Div Womens Hlth, Boston, MA 02115 USA
[3] Dimock Ctr, Dept Obstet & Gynecol, Roxbury, MA USA
[4] Harvard Humanitarian Initiat, Cambridge, MA USA