Affiliation: | 1. Department of Orthopedic Surgery, Sapporo Medical University School of Medicine, Sapporo, Hokkaido, Japan;2. Department of Pathology, Sapporo Medical University School of Medicine, Sapporo, Hokkaido, Japan;3. Department of Diagnostic Pathology, Sapporo Medical University School of Medicine, Sapporo, Hokkaido, Japan;4. Department of Public Health, Sapporo Medical University School of Medicine, Sapporo, Hokkaido, Japan;5. Department of Orthopedic Surgery, Hokkaido Cancer Center, Sapporo, Hokkaido, Japan;6. Department of Orthopedic Surgery, Saiseikai Otaru Hospital, Otaru, Hokkaido, Japan |