1. Department of Orthopedics, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770‑8503, Japan
2. Division of Pathology, Tokushima University Hospital, Tokushima 770‑8503, Japan
3. Department of Radiation Oncology, Hyogo Ion Beam Medical Center Kobe Proton Center, Kobe, Hyogo 650‑0047, Japan
4. Department of Radiology, Hyogo Ion Beam Medical Center, Hyogo 679‑5165, Japan