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