1. Department of Orthopaedic Surgery, Saitama Medical Center, Saitama Medical University, Saitama, Japan.
2. Department of Orthopaedic Surgery, Tokyo Teishin Hospital, Tokyo, Japan.
3. Department of Orthopaedic Surgery, Yokohama Rosai Hospital, Yokohama, Kanagawa, Japan.
4. Department of Orthopaedic Surgery, Wakaba Hospital, Sakado-shi, Saitama, Japan.
5. Department of Orthopaedic Surgery, Misu Clinic, Kasukabe-shi, Saitama, Japan.
6. Center for University-wide Education, Saitama Prefectural University, Koshigaya-shi, Saitama, Japan.