1. Department of Orthopaedic Surgery, Korea University Anam Hospital, Seoul, Korea
2. Department of Orthopaedic Surgery, Korea University Ansan Hospital, Ansan, Korea
3. Department of Biomedical Engineering, Inje University, Gimhae, Korea
4. Department of Orthopaedic Surgery, Inje University Ilsan Paik Hospital, Ilsan, Korea