1. Department of Cytobiology, Institute of Cancer Prevention and Treatment, Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China
2. Department of Pathology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
3. Department of Biomedical Mathematics, College of Bioinformatics Science and Technology, Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China
4. Department of Laboratory Diagnostics, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China