1 Department of Obstetrics and Gynecology, Penn State University Hershey Medical Center, Hershey, Pennsylvania; the Bixby Center for Global Reproductive Health, University of California, San Francisco, San Francisco, California; the Department of Obstetrics and Gynecology, University of Texas Rio Grande Valley, Edinburg, Texas; and the Department of Obstetrics and Gynecology, University of Tennessee Medical Center, Knoxville, Tennessee.