1. Center for Sports Medicine, Daini Osaka Police Hospital, Osaka, Japan.
2. Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Suita, Japan.
3. Department of Orthopaedic Surgery, Japan Community Healthcare Organization Osaka Hospital, Osaka, Japan.
4. Department of Orthopaedic Surgery, Daini Osaka Police Hospital, Osaka, Japan.