1. Department of Pathophysiology, Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
2. Department of Rehabilitation, The Second Affiliated Hospital of Heilongjiang University of Chinese Medicine, Harbin, Heilongjiang 150001, P.R. China
3. Department of Infectious Diseases, General Hospital for The Head Office of Agricultural Cultivation of Heilongjiang, Harbin, Heilongjiang 150088, P.R. China
4. Department of Anesthesiology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China