Affiliation: | aDivision of Hematology, Department of Internal Medicine, Keio University, School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan bDivision of Hematology, Department of Internal Medicine, National Hospital Organization, Tokyo Medical Center, Tokyo, Japan cDepartment of Internal medicine, Fuji Xerox Health Promotion Center, Tokyo, Japan |