1. Department of Orthopaedic Surgery; Fukushima Medical University School of Medicine; Fukushima Japan
2. Division of Orthopedic Surgery; Southern Tohoku Fukushima Hospital; Fukushima Japan
3. Department of Pathology and Diagnostic Pathology; Fukushima Medical University School of Medicine; Fukushima Japan
4. Department of Radiology; Fukushima Medical University School of Medicine; Fukushima Japan
5. Fukushima Pathology Laboratory; Fukushima Japan