1. Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
2. Department of Obstetrics and Gynecology, Hallym University Dongtan Sacred Heart Hospital, Gyeonggi-do, Korea
3. Department of Rehabilitation Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
4. Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seongnam, Korea