1. Department of Obstetrics and Gynecology, Gangnam Severance Hospital, Institute of Women’s Life Medical Science, Yonsei University College of Medicine, Seoul, Korea
2. Department of Obstetrics and Gynecology, Severance Hospital, Institute of Women’s Life Medical Science, Yonsei University College of Medicine, Seoul, Korea
3. Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
4. Biostatics Collaboration Unit, Yonsei University College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea