1. Department of Joint Surgery and Sports Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
2. Department of Orthopaedic Surgery, Hospital of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
3. Department of Orthopaedic Surgery, Graduate School of Medicine, Kobe University, Kobe, Japan
4. National Hospital Organization Disaster Medical Center, Tachikawa-shi, Japan