1. Department of Hematology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang�150036, P.R. China
2. Department of Hematology, Heilongjiang Provincial Hospital, Harbin, Heilongjiang�150036, P.R. China
3. Department of Infectious Diseases, Heilongjiang Provincial Hospital, Harbin, Heilongjiang�150036, P.R. China
4. Department of Hematology, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang�150036, P.R. China
5. Department of Hematology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150036, P.R. China