1. Division of Hematology/Oncology Department of Internal Medicine Kameda Medical Center Kamogawa Japan
2. Department of Hematology, Nephrology, and Rheumatology Akita University Graduate School of Medicine Akita Japan
3. Department of Hematology Graduate School of Comprehensive Human Sciences University of Tsukuba Tsukuba Japan
4. Department of Radiology Kameda Medical Center Kamogawa Japan