1. Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, Tokyo, Japan;
2. Department of Orthopaedic Surgery, Saitama Medical Center, Jichi Medical University, Saitama, Japan;
3. Department of Medical Research and Management for Musculoskeletal Pain, 22nd Century Medical & Research Center, Faculty of Medicine, The University of Tokyo, Tokyo, Japan;
4. Department of Nephrology and Endocrinology, Faculty of Medicine, University of Tokyo, Tokyo, Japan;
5. Department of Orthopaedic Surgery, Faculty of Medicine, University of Teikyo, Tokyo, Japan