1. Department of Cerebral Surgery, The Second Affiliated Hospital of Qiqihar Medical University, Qiqihar, Heilongjiang 161000, P.R. China
2. Department of Physiology, Physiology Section of Basic Medical Science College, Qiqihar Medical University, Qiqihar, Heilongjiang 161000, P.R. China
3. Central Laboratory, General Hospital of Daqing Oil Field, Daqing, Heilongjiang 163411, P.R. China
4. Department of Pathogen Biology, Medical Technology College of Qiqihar Medical University, Qiqihar, Heilongjiang 161000, P.R. China
5. Department of Immunology, Medical Technology College of Qiqihar Medical University, Qiqihar, Heilongjiang 161000, P.R. China