Young Mi Jung 1, Seung Mi Lee 1, Sun Min Kim 2, Byoung Jae Kim 2, Seokyung Han 3, Jeong Woo Park 4, Hyun Soo Park 5, Kyung A. Lee 6, Chan-Wook Park 1, Jong Kwan Jun 1, Joong Shin Park 1
1 Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Republic of Korea
2 Department of Obstetrics and Gynecology, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Republic of Korea
3 Medical Statistics Lab, Department of Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
4 Grace Hospital, Goyang, Republic of Korea
5 Department of Obstetrics and Gynecology, Dongguk university Ilsan Hospital, Goyang, Republic of Korea
6 Department of Obstetrics and Gynecology, Kyung Hee University Medical Center, Kyung Hee University School of Medicine, Seoul, Republic of Korea