1. Department of Surgery, Lin Women's Hospital, Seoul, Korea.
2. Division of Orthopaedic Surgery, Glasgow Royal Infirmary, Glasgow, UK.
3. Department of Orthopedic Surgery, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
5. Department of Orthopedic Surgery, Seoul National University Hospital, Seoul, Korea.