Tae-Hee Kim1, Hae-Hyeog Lee2, Jun-Mo Kim3. 1. Department of Obstetrics and Gynecology, Soonchunhyang University College of Medicine, Bucheon, Republic of Korea. 2. Department of Obstetrics and Gynecology, Soonchunhyang University College of Medicine, Bucheon, Republic of Korea. Electronic address: hhl22@schmc.ac.kr. 3. Department of Urology, Soonchunhyang University College of Medicine, Bucheon, Republic of Korea.