1. 16 Gou Orthopaedic Clinic: 1-3-7 Takane, Chuo-ku, Sagamihara-shi, Kanagawa 252-0221, Japan
2. School of Computer Science, Tokyo University of Technology, Japan
3. Department of Orthopaedic Surgery, Kurashiki Medical Center, Japan
4. Department of Rehabilitation, Kurashiki Medical Center, Japan
5. Department of Medical Research and Management for Musculoskeletal Pain, 22nd Century Medical & Research Center, Faculty of Medicine, The University of Tokyo, Japan