1. Department of Pathology, Kurume University School of Medicine, Kurume, Japan;
2. Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan;
3. Department of Hematology, Atomic Bomb Disease and Hibakusha Medicine Unit, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan;
4. Department of Surgery, Kurume University School of Medicine, Kurume, Japan;
5. Department of Hematology, Sasebo City General Hospital, Sasebo, Japan; and
6. Department of Medicine and Biosystemic Science, Kyushu University Faculty of Medicine, Fukuoka, Japan