1. Department of Pathogen Biology, Qiqihar Medical University, Qiqihar, Heilongjiang 161006, P.R. China
2. Department of Medical Research, The Second Affiliated Hospital, Qiqihar Medical University, Qiqihar, Heilongjiang 161006, P.R. China
3. Department of Pharmacology, Qiqihar Medical University, Qiqihar, Heilongjiang 161006, P.R. China
4. Department of Medical Research, The First Affiliated Hospital, Qiqihar Medical University, Qiqihar, Heilongjiang 161041, P.R. China