1. Department of Orthopedic Surgery, Gyeongsang National University Hospital, Jinju, Korea.
2. Department of Healthcare Management, Graduate School of Public Health, Yonsei University, Seoul, Korea.
3. Department of Orthopedic Surgery, Daejeon Eulji Medical Center, Eulji University School of Medicine, Daejeon, Korea.
4. Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.