Affiliation: | (1) Department of Orthopaedic Surgery, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan;(2) Department of Advanced Therapy for Spine and Spinal Cord Diseases, School of Medicine, Keio University, Tokyo, Japan;(3) Division of Diagnostic Pathology, School of Medicine, Keio University, Tokyo, Japan |