1. Department of Neurology, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
2. Department of Nursing, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
3. Department of Cardiology, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
4. Department of Surgery, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China