1. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Yonsei University College of Medicine, Yonsei University Health System, Seoul, Korea.
2. Division of Neuroradiology, Department of Radiology, Yonsei University College of Medicine, Yonsei University Health System, Seoul, Korea.
3. Division of Endocrinology, Department of Internal Medicine, Yonsei University College of Medicine, Yonsei University Health System, Seoul, Korea.