1. Department of Hematology, Fujioka General Hospital, Gunma, Japan
2. Department of Hematology, National Hospital Organization Shibukawa Medical Center, Gunma, Japan
3. Department of Hematology, Gunma University Hospital, Gunma, Japan
4. Leukemia Research Center, Saiseikai Maebashi Hospital, Gunma, Japan
5. Department of Hematology, Maebashi Red Cross Hospital, Gunma, Japan
6. Department of Pathology, Fujioka General Hospital, Gunma, Japan