| information about the organization
| - 1Division of Radiation Oncology, National Cancer Center Hospital East, Kashiwa, Chiba, 2Department of Radiation Oncology, Aichi Cancer Center, Nagoya, 3Department of Radiation Oncology, National Sapporo Hospital, Sapporo, 4Department of Clinical Radiology, Kyushu University, Fukuoka, 5Department of Radiation Oncology, University of the Ryukyus, Okinawa, 6Department of Head and Neck Surgery, Miyagi Cancer Center, Sendai, 7Department of Radiation Oncology, Nagasaki University, Nagasaki, 8Department of Radiation Oncology, University of Yamanashi, Kofu, 9Department of Radiology, Shinshu University, School of Medicine, Matsumoto, Nagano, 10Department of Otolaryngology, Fukushima Medical University, Fukushima and 11Department of Radiation Oncology, National Kure Medical Center, Kure, Hiroshima, Japan
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