1. Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan
2. Department of Diagnostic Radiology, Keio University School of Medicine, Tokyo, Japan
3. Department of Preventive Medicine and Public Health, Keio University School of Medicine, Tokyo, Japan
4. Keio University Tsukigase Rehabilitation Center, Shizuoka, Japan
5. Department of Orthopaedic Surgery, Tokai University School of Medicine, Kanagwa, Japan
6. Department of Orthopaedic Surgery, Kyorin University School of Medicine, Tokyo, Japan
7. Department of Orthopaedic Surgery, Isehara Kyodo Hospital, Isehara, Japan