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, Iizuka Hospital, Iizuka, Japan;
4. Department of Geriatric Medicine, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan;
5. Department of Hematology, National Kyushu Cancer Center, Fukuoka, Japan;
6. Division of Hematology and Oncology, Department of Medicine, Kurume University School of Medicine, Kurume, Japan; and
7. Department of Medicine and Biosystemic Science, Kyushu University Faculty of Medicine, Fukuoka, Japan