1. Department of Pathology, Mudanjiang Medical College, Mudanjiang, Heilongjiang 157011, P.R. China
2. Department of Anatomy, Mudanjiang Medical College, Mudanjiang, Heilongjiang 157011, P.R. China
3. Department of Infectious Disease, Hongqi Hospital, Mudanjiang Medical College, Mudanjiang, Heilongjiang 157011, P.R. China
4. School of Adult Education, Mudanjiang Medical College, Mudanjiang, Heilongjiang 157011, P.R. China
5. Department of Laboratory Medicine, Hongqi Hospital, Mudanjiang Medical College, Mudanjiang, Heilongjiang 157011, P.R. China
6. Medical Pharmacology Research Center, Mudanjiang Medical College, Mudanjiang, Heilongjiang 157011, P.R. China