1. Department of Hematology; Yokohama City University Medical Center; Yokohama Japan
2. Department of Hematology and Rheumatology; Fujisawa City Hospital; Yokohama Japan
3. Department of Internal Medicine and Clinical Immunology, Yokohama City University; Graduate School of Medicine; Yokohama Japan
4. Department of Hematology-Oncology; Tokai University; Isehara Japan
5. Department of Hematology; Kitasato University School of Medicine; Sagamihara Japan