1 Department of Radiation Oncology, Hyogo Ion Beam Medical Center Kobe Proton Center, Japan; Department of Radiology, Hyogo Ion Beam Medical Center, Tatsuno, Japan.
2 QST Hospital, Quantum Medical Science Directorate, National Institute for Quantum and Radiological Sciences and Technology, Inage, Japan.
3 Department of Radiation Oncology, Japanese Red Cross Maebashi Hospital, Maebashi, Japan.
4 Ion Beam Therapy Center, SAGA-HIMAT Foundation, Tosu, Japan.
5 Gunma University Heavy Ion Medical Center, Maebashi, Japan.
6 Department of Radiology, Hyogo Ion Beam Medical Center, Tatsuno, Japan.
7 Department of Radiation Oncology, Yamagata University, Faculty of Medicine, Japan.
8 National Institute of Radiological Sciences, Quantum Medical Science Directorate, National Institute for Quantum and Radiological Sciences and Technology, Inage, Japan.
9 Ion-beam Radiation Oncology Center, Kanagawa Cancer Center, Yokohama, Japan. Electronic address: [email protected].