1. Department of Medical Research and Management for Musculoskeletal Pain, 22nd Century Medical & Research Center, The University of Tokyo, Tokyo, Japan;
2. Department of Orthopaedic Surgery, Saitama Medical University, Saitama, Japan;
3. Department of Orthopaedic Surgery, Sagamihara Hospital, National Hospital Organization, Kanagawa, Japan;
4. Department of Orthopaedic Surgery, Teikyo University Mizonokuchi Hospital, Kanagawa, Japan;
5. Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, Tokyo, Japan