Tae-Hee Kim1, Hae-Hyeog Lee, Jun-Mo Kim. 1. Department of Obstetrics and Gynecology, Soonchunhyang University College of Medicine, Soonchunhyang University Bucheon Hospital, 170 Jomaru-ro, Wonmi-gu, Bucheon-si, Gyeunggi-do, 420-767, Republic of Korea.