1. Laboratory of Environmental Health Science, Oita University of Nursing and Health Sciences, Oita City, Japan
2. Institute of Radiation Emergency Medicine, Hirosaki University, Hirosaki City, Japan
3. Integrated Center for Science and Humanities, Fukushima Medical University, Fukushima City, Japan
4. Department of Radiation Biology, Tohoku University Grauduate School of Medicine, Sendai City, Japan