1. Department of Internal Medicine, Endocrine Research Institute, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Yonsei Wonju College of Medicine, Wonju, Korea.
3. Department of Internal Medicine, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.
4. Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Orthopaedic Surgery, Seoul National University College of Medicine and Seoul National University Bundang Hospital, Seongnam, Korea.
6. Department of Orthopaedic Surgery, School of Medicine, Konkuk University, Seoul, Korea.
7. Department of Orthopaedic Surgery, College of Medicine, Chung-Ang University, Seoul, Korea.
8. Department of Orthopaedic Surgery, Seoul National University Bundang Hospital and Kay Joint Center at Cheil Orthopaedic Hospital, Seoul, Korea.