∗Associate Professor

†Professor, Department of Obstetrics and Gynecology, College of Medicine, The Catholic University of Korea, Seoul, South Korea

‡Professor, Department of Obstetrics and Gynecology, School of Medicine, Catholic University of Daegu, South Korea

§Professor, Department of Obstetrics and Gynecology, School of Medicine, Kyungpook National University, Daegu, South Korea

∥Professor, Department of Obstetrics and Gynecology, School of Medicine, Kangwon National University, Chuncheon, South Korea

¶Professor, Department of Obstetrics and Gynecology, CHA Gangnam Medical Center, CHA University School of Medicine, Seoul, South Korea

#Professor, Department of Obstetrics and Gynecology, College of Medicine, Korea University, Seoul, South Korea

All authors, faculty, and staff have no relevant financial relationships with any ineligible organizations regarding this educational activity.

Correspondence requests to: In Yang Park, MD, Department of Obstetrics and Gynecology, Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul 06591, South Korea. E-mail: [email protected].