1Hematology, Kumamoto University Hospital, Kumamoto, Japan
2Department of Hematology, Kumamoto University Hospital, Kumamoto, Japan
3Department of Medicine and Bioregulatory Sciences, The University of Tokushima Graduate School of Health Biosciences, Tokushima, Japan
4Hematology, Kumamoto University Hospital, Japan
5Department of Surgical Pathology, Kumamoto University Hospital, Kumamoto, Japan