1. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Oregon Health and Science University, Portland, Oregon, Division of Perinatal Medicine, Department of Reproductive Medicine, University of California, San Diego
2. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Oregon Health and Science University, Portland, Oregon, , Division of Perinatal Medicine, Department of Reproductive Medicine, University of California, San Diego