1. Division of Endocrinology and Metabolism, Department of Internal Medicine, Inha University Hospital, Inha University School of Medicine, Incheon, Korea.
2. Division of Endocrinology and Metabolism, Department of Internal Medicine, Kyung Hee University Hospital, Seoul, Korea.
3. Department of Orthopaedic Surgery, Gyeongsang National University Hospital, Jinju, Korea.
4. Department of Obstetrics and Gynecology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
5. Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.
6. Department of Orthopaedic Surgery, Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea.
7. Division of Endocrinology, Department of Internal Medicine, Wonkwang University Sanbon Hospital, Wonkwang University School of Medicine, Gunpo, Korea.
8. Division of Endocrinology and Metabolism, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
9. Department of Laboratory Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.