1. Department of Medicine and Clinical Science; Gunma University; Gunma Japan
2. Department of Hematology and Oncology; Tokai University School of Medicine; Kanagawa Japan
3. Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
4. Hematology Division; Tokyo Metropolitan Cancer and Infectious Diseases Center; Komagome Hospital; Tokyo Japan
5. Division of Hematology; Department of Medicine; Keio University School of Medicine; Tokyo Japan
6. Leukemia Research Center; Saiseikai Maebashi Hospital; Gunma Japan
7. Department of Hematology; Kanagawa Cancer Center; Kanagawa Japan
8. Department of Internal Medicine; Tokyo Metropolitan Ohtsuka Hospital; Tokyo Japan