1. Department of Orthopaedic Surgery, Konyang University Hospital, Daejeon, Korea
2. Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Gyeonggi, Korea
3. Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul, Korea
4. Department of Orthopaedic Surgery, Dongguk University Ilsan Hospital, Gyeonggi, Korea