1. Department of Bioscience and Laboratory Medicine, Graduate School of Health Sciences, Hirosaki University, Hirosaki, Japan;
2. Department of Radiation Biology, Tohoku University School of Medicine, Sendai, Japan;
3. Department of Radiation Life Sciences, Fukushima Medical University School of Medicine, Fukushima, Japan;
4. Department of Radiation Biology, Institute of Radiation Emergency Medicine, Hirosaki University, Hirosaki, Japan;
5. Consumer and Clinical Radiation Protection Bureau, Healthy Environments and Consumer Safety Branch, Ottawa, ON, Canada;
6. Armed Forces Radiobiology Research Institute, Uniformed Services University of the Health Sciences, Bethesda, MD, USA