1. Department of Orthopaedic Surgery, Chung-Ang University College of Medicine, Seoul, Korea.
2. Department of Orthopaedic Surgery, Daejeon Eulji Medical Center, Eulji University School of Medicine, Daejeon, Korea.
3. Department of Orthopaedic Surgery, Gyeongsang National University Hospital, Jinju, Korea.
4. Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.