1. Division of Sports Medicine, Saitama Medical University, Saitama, Japan
2. Department of Orthopaedic Surgery, Saitama Medical University, Saitama, Japan
3. Department of Orthopaedic Surgery, Ogawa Red Cross Hospital, Saitama, Japan
4. Department of Orthopaedic Surgery, Asakadai Central General Hospital, Saitama, Japan