1. Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, Fukushima 960‑1295, Japan
2. Department of Radiology, Fukushima Medical University School of Medicine, Fukushima 960‑1295, Japan
3. Department of Pathology and Diagnostic Pathology, Fukushima Medical University School of Medicine, Fukushima 960‑1295, Japan