1. Department of Obstetrics and Gynecology (W.X.W., T.C., K.C., V.C.), University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104
2. Department of Obstetrics and Gynecology (J.R.), Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157
3. Department of Obstetrics and Gynecology (P.W.N.), Center for Women’s Health Research, New York University Medical School, New York, New York 10016