1. Department of Radiation Medical Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
2. Department of Health Risk Control, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
3. Department of Tumor and Diagnostic Pathology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
4. Nagasaki University Research Center for Genomic Instability and Carcinogenesis, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
5. Fukushima Medical University, Fukushima, Japan.