1. Department of Orthopaedics and Rehabilitation Medicine, University of Fukui Faculty of Medical Sciences, Eiheiji, Fukui 910‑1193, Japan
2. Division of Diagnostic Pathology/Surgical Pathology, University of Fukui Hospital, Eiheiji, Fukui 910‑1193, Japan
3. Department of Pathology, Kanazawa University, Kanazawa, Ishikawa 920‑8641, Japan