1. Department of Radioisotope Medicine, Atomic Bomb Disease and Hibakusha Medicine Unit, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Nagasaki 852-8523, Japan
2. Department of Molecular Medicine, Nagasaki University, Graduate School of Biomedical Sciences, Nagasaki, Nagasaki 852-8523, Japan
3. Department of Tumor and Diagnostic Pathology, Atomic Bomb Disease and Hibakusha Medicine Unit, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Nagasaki 852-8523, Japan
4. Joint Research Office, Research Promotion Division, Office for Research Initiative and Development, Nagasaki University, Nagasaki, Nagasaki 852-8521, Japan