1. Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Seongnam, Korea
2. Department of Orthopedic Surgery, Hallym University Sacred Heart Hospital, Anyang, Korea
3. Department of Orthopedic Surgery, Soonchunhyang University Hospital Cheonan, Cheonan, Korea
4. Department of Orthopedic Surgery, Ajou University College of Medicine, Suwon, Korea