1. Department of Health and Environmental Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan
2. Department of Neurosurgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
3. Department of Preventive Medicine, St Marianna University School of Medicine, Kawasaki, Japan
4. Department of Systems Science, Graduate School of Informatics, Kyoto University, Kyoto, Japan
5. Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
6. Radiation Biology Center, Kyoto University, Kyoto, Japan