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