1. Department of Colorectal Surgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
2. Department of Pharmacology, Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
3. Department of Neurology, Heilongjiang University of Traditional Medicine, Harbin, Heilongjiang 15008, P.R. China