1. Department of Orthopaedic Surgery, St. Vincent's Hospital, College of Medicine The Catholic University of Korea Seoul Republic of Korea
2. Department of Orthopaedic Surgery, Yeouido St. Mary's Hospital, College of Medicine The Catholic University of Korea Seoul Republic of Korea
3. Department of Mechanical Engineering Sejong University Seoul Republic of Korea
4. Department of Orthopaedic Surgery, Bucheon St. Mary's Hospital, College of Medicine The Catholic University of Korea Seoul Republic of Korea