1. Department of Obstetrics and Gynecology, College of Physicians and Surgeons, Columbia University, New York, New York
2. Department of Obstetrics and Gynecology, Eastside Medical Center, Snellville, Georgia
3. Division of Maternal Fetal Medicine, Evergreen Health, Kirkland, Washington
4. Department of Patient Safety, Dignity Health, San Francisco, California
5. Division of Maternal Fetal Medicine, Marian Regional Medical Center, Santa Maria, California