1. Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California San Francisco, San Francisco, California
2. Maternal Fetal Care Center, Florida Hospital Medical Group, Orlando, Florida
3. Division of Maternal-Fetal Medicine, Department of Obstetrics & Gynecology, Brown University Warren Alpert Medical School, Providence, Rhode Island
4. Department of Obstetrics, Gynecology, and Reproductive Science, Mount Sinai Hospital, New York, New York