1. Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Orthopaedic Surgery, Chung-Ang University College of Medicine, Seoul, Korea.
3. Division of Endocrinology, Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.
4. Division of Endocrinology and Metabolism, Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.