1. Department of Orthopaedic Surgery, Gyeongsang National University Hospital, Jinju, Korea.
2. Department of Healthcare Management, Graduate School of Public Health, Yonsei University, Seoul, Korea.
3. Department of Orthopaedic Surgery, Eulji University Hospital, Daejeon, Korea.
4. Department of Orthopaedic Surgery, Yeungnam University Medical Center, Daegu, Korea.
5. Department of Orthopaedic Surgery, Ajou Medical Center, Suwon, Korea.