Department of Obstetrics, Gynecology, and Reproductive Sciences, Division of Maternal-Fetal Medicine, University of California, La Jolla, California

The authors declare that they have nothing to disclose.

Correspondence: Cynthia Gyamfi-Bannerman, MD, MS, Department of Obstetrics, Gynecology, and Reproductive Sciences, Division of Maternal-Fetal Medicine, University of California, 9444 Medical Center Drive, Room 2-070, La Jolla, CA. E-mail: [email protected]