1. Department of Obstetrics and Gynecology, Naval Hospital, Camp Pendleton, CA 92055
2. Maternal-Fetal Medicine, University of Mississippi Medical Center, Jackson, MI 39216-4505
3. Department of Obstetrics and Gynecology, Naval Medical Center, San Diego, CA 92134-5000
4. Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, MI 39216-4505