1. Department of Orthopaedic Surgery, National Police Hospital, Seoul, Korea
2. Department of Orthopaedic Surgery, Bundang Jesaeng Genenral Hospital, Seongnam, Korea
3. Department of Orthopaedic Surgery, Sun’s Hospital, Seoul, Korea
4. Department of Orthopaedic Surgery, Incheon Sarang Hospital, Incheon, Korea
5. Department of Orthopeadic Surgery, Kyung Hee University College of Medicine, Kyung Hee University Hospital, Seoul, Korea
6. Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea