Affiliation: | a Department of Orthopaedic Surgery, Saitama Medical Center, Saitama Medical University, Saitama, Japan;b Department of Pathology, Saitama Medical Center, Saitama Medical University, Kawagoe, Saitama, Japan;c Department of Neurosurgery, Saitama Medical Center, Saitama Medical University, Saitama, Japan;d Department of General Medicine, Saitama Medical Center, Saitama Medical University, Saitama, Japan. |