1. Department of Obstetrics and Gynecology CHA Ilsan Medical CenterCHA University Goyang Republic of Korea
2. Department of Obstetrics and Gynecology CHA Gangnam Medical CenterCHA University Seoul Republic of Korea
3. Department of Obstetrics and Gynecology CHA Bundang Medical CenterCHA University Seongnam Republic of Korea
4. Division of Biostatistics Department of Biomedical Systems Informatics Yonsei University College of Medicine Seoul Republic of Korea
5. Department of Obstetrics and Gynecology Ajou University HospitalAjou University School of Medicine Suwon Republic of Korea
6. Departments of Obstetrics and Gynecology Gangseo Mizmedi Hospital Seoul Republic of Korea
7. Department of Obstetrics and Gynecology Asan Medical CenterUniversity of Ulsan College of Medicine Seoul Republic of Korea
8. Department of Psychiatry Myongji HospitalHanyang University College of Medicine Goyang Republic of Korea