1. Department of Applied Pharmacology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
2. Department of Radiation Biology and Medicine, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Japan
3. Department of Restorative Dentistry and Endodontology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
4. Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, Yamagata, Japan
5. Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan