1. Department of Allergy and Rheumatology Nippon Medical School Graduate School of Medicine Japan
2. First Department of Internal Medicine Kansai Medical University Hirakata Japan
3. Division of Hematology and Oncology, Department of Internal Medicine Iwate Medical University Morioka Japan
4. Department of Hematology and Rheumatology Nihon University School of Medicine Tokyo Japan
5. Department of Hematology Fujisawa City Hospital Fujisawa Japan
6. Department of Hematology Hamamatsu Medical Center Hamamatsu Japan
7. Department of Hematology and Oncology Toyohashi Municipal Hospital Toyohashi Japan
8. Division of Hematology, Department of Internal Medicine National Hospital Organization Tokyo Medical Center Meguro‐ku Japan
9. Hematology and Oncology Division Japanese Red Cross Fukuoka Hospital Fukuoka Japan
10. Kissei Pharmaceutical Co., Ltd. Tokyo Japan
11. Department of Blood Transfusion Osaka University Hospital Suita Japan