1. Gunma University Heavy Ion Medical Center; Maebashi Japan
2. Department of Radiology; Hyogo Ion Beam Medical Center; Tatsuno Japan
3. Ion Beam Therapy Center; SAGA-HIMAT Foundation; Tosu Japan
4. National Institute of Radiological Science Hospital; National Institutes for Quantum and Radiological Sciences and Technology; Chiba Japan
5. Department of Radiation Oncology; Yamagata University Faculty of Medicine; Yamagata Japan