1. Division of Endocrinology, Department of Internal Medicine, College of Medicine, Hanyang University, Seoul, Korea.
2. Department of Family Medicine, College of Medicine, Kwandong University, Cheil General Hospital, Seoul, Korea.
3. Department of Gynecology, Inje University Sanggye Paik Hospital, Seoul, Korea.
4. Department of Obstetrics and Gynecology, College of Medicine, Seoul National University, Seoul, Korea.
5. Division of Endocrinology and Endocrine Research Institute, Department of Internal Medicine, College of Medicine, Yonsei University, Seoul, Korea.
6. Division of Chronic Disease Surveillance, Korea Centers for Disease Control and Prevention, Cheongwon, Korea.
7. Hologic, Inc., Bedford, Massachusetts, United States of America.