1. Department of Orthopaedic Surgery, Soonchunhyang University Hospital Seoul, Seoul, Korea.
2. Department of Orthopaedic Surgery, Nowon Eulji Medical Center, Eulji University, Seoul, Korea.
3. Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Department of Orthopaedic Surgery, Daejeon Eulji Medical Center, Eulji University, Daejeon, Korea.
5. Department of Orthopaedic Surgery, Dankook University Hospital, Cheonan, Korea.
6. Department of Orthopaedic Surgery, Inha University Hospital, Incheon, Korea.
7. Department of Orthopaedic Surgery, Ajou University Hospital, Suwon, Korea.
8. Kay Joint Center at Cheil Orthopaedic Hospital, Seoul, Korea.