1 National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1, Anagawa, Inage-ku, Chiba, 263-8555, Japan. kanda.reiko@qst.go.jp.
2 Japan Network for Research and Information On Medical Exposures (J-RIME), 4-9-1, Anagawa, Inage-ku, Chiba, 263-8555, Japan. kanda.reiko@qst.go.jp.
3 Department of Radiology, School of Medicine, International University of Health and Welfare, 4-3, Kozunomori, Narita, Chiba, 286-8686, Japan.
4 Japan Network for Research and Information On Medical Exposures (J-RIME), 4-9-1, Anagawa, Inage-ku, Chiba, 263-8555, Japan.
5 National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1, Anagawa, Inage-ku, Chiba, 263-8555, Japan.
6 Department of Radiology, Kindai University, 377-2, Ohnohigashi, Osakasayama, Osaka, 589-8511, Japan.