1. Department of Orthopaedic Surgery, Faculty of Medicine; University of Yamanashi; Chuo Yamanashi Japan
2. Department of Orthopedic Surgery; Kikyougahara Hospital; Shiojiri Nagano Japan
3. Department of Orthopaedics; Vanderbilt University Medical Center; Nashville Tennessee Japan
4. The Sports Medicine and Knee Center; Kofu National Hospital; Kofu Yamanashi Japan