1. Department of Orthopaedic Surgery, Gyeongsang National University Hospital, Jinju, Korea.
2. Department of Orthopedic Surgery, Ajou Medical Center, Ajou University School of Medicine, Suwon, Korea.
3. Department of Orthopedic Surgery, Yeungnam University Medical Center, Daegu, Korea.
4. Department of Orthopaedic Surgery, Daejeon Eulji Medical Center, Eulji University School of Medicine, Daejeon, Korea.