1. Department of Orthopaedic Surgery, Eulji University Hospital, Daejeon, Korea,
2. Department of Orthopaedic Surgery, Gyeongsang National University Hospital, Jinju, Korea,
3. Department of Orthopedic Surgery, Ajou Medical Center, Ajou University School of Medicine, Suwon, Korea,
4. Department of Orthopedic Surgery, Yeungnam University Medical Center, Daegu, Korea,
5. Department of Orthopedic Surgey, Chung-Ang University College of Medicine, Seoul, Korea,
6. Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seongnam, Korea,