1. Department of Hematology, National Hospital Organization Okayama Medical Center, Japan
2. Department of Pathology, National Hospital Organization Okayama Medical Center, Japan
3. Department of Pathology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Japan
4. Department of Hematology and Oncology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Japan