[1] Keio University School of Medicine,Department of Orthopaedic Surgery
[2] Keio Spine Research Group (KSRG),Department of Orthopaedic Surgery
[3] Ogikubo Hospital,Department of Orthopaedic Surgery
[4] Saitama Medical Center,Department of Orthopaedic Surgery
[5] Fussa Hospital,Spine and Spinal cord Center
[6] International University of Health and Welfare (IUHW) Mita Hospital,Department of Orthopaedic Surgery, School of Medicine
[7] International University of Health and Welfare (IUHW),Department of Orthopaedic Surgery
[8] Isehara Kyodo Hospital,Department of Orthopaedic Surgery
[9] Saiseikai Yokohamashi Tobu Hospital,Department of Orthopaedic Surgery
[10] Tokyo Dental College Ichikawa General Hospital,Department of Orthopaedic Surgery
[11] National Hospital Organization Murayama Medical Center,undefined