1. Division of Hematology; Department of Internal Medicine; Hyogo College of Medicine; Hyogo Japan
2. Department of Hematology; Kawasaki Medical School; Kurashiki Japan
3. Division of Hematology-Oncology; Japanese Red Cross Society Narita Hospital; Narita Japan
4. Hematology Division; Tokyo Metropolitan Cancer and Infectious diseases Center; Komagome Hospital; Tokyo Japan
5. Department of Transfusion Medicine; Hyogo College of Medicine; Nishinomiya Japan
6. Department of Biostatistics; Hyogo College of Medicine; Nishinomiya Japan