1. Department of Information Statistics, Andong National University, Andong, Korea.
2. Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Anatomy, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Orthopaedic Surgery, School of Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
5. College of Pharmacy, Gachon University, Incheon, Korea.
6. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
7. Department of Preventive Medicine, Ajou University School of Medicine, Suwon, Korea.