1. Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Orthopaedic Surgery, Myongji Hospital, Goyang, Korea.
3. Department of Orthopaedic Surgery, Ewha Womans University Hospital, Seoul, Korea.
4. Department of Orthopaedic Surgery, Gwang Hye Hospital, Busan, Korea.
5. Department of Orthopaedic Surgery, Konyang University Hospital, Daejeon, Korea.
6. Biomedical Research Institute, Seoul National University Bundang Hospital, Seongnam, Korea.