1. Department of Hematology, Kitasato University Graduate School of Medical Sciences, Sagamihara 252-0373, Kanagawa, Japan
2. Division of Clinical Oncology and Hematology, Department of Internal Medicine, The Jikei University School of Medicine, Minato City 105-8461, Tokyo, Japan
3. Department of Hematology, Kitasato University School of Medicine, Sagamihara 252-0374, Kanagawa, Japan