1. From the Department of Radiology (K.H., M.D.K., G.M.K., J.H.K., H.J.K., J.Y.W., D.Y.L.) and Division of Gynecologic Endocrinology, Department of Obstetrics and Gynecology (S.K.S.), Severance Hospital, Research Institute of Radiological Science, Yonsei University College of Medicine, 50-1 Yonsei-ro Seodaemun-gu, Seoul 03722, Korea.