1. Department of Health Sciences, Division of Medical Quantum Radiation Sciences, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
2. Department of Radiology, Hospital of University of Occupational and Environmental Health, Fukuoka, Japan
3. Department of Radiology, Nagoya City University Hospital, Nagoya, Japan
4. Department of Radiology, Kitakyushu Municipal Medical Center, Fukuoka, Japan
5. Department of Radiology, Kurume University Hospital, Fukuoka, Japan
6. Department of Radiology, Medical Technology, Kyushu University Hospital, Fukuoka, Japan
7. Ion Beam Therapy Center, SAGA-HIMAT Foundation, Tosu, Japan
8. Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan