1. Department of Hematology, Nagasaki University Hospital, Nagasaki, Japan
2. Department of Hematology, Atomic Bomb Disease and Hibakusha Medicine Unit, Atomic Bomb Disease Institute, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
3. Central Diagnostic Laboratory of Nagasaki University Hospital, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan