1. Department of Anesthesiology (Qunli Campus), The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, P.R China
2. Department of Neurosrugery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, P.R China
3. Department of Anesthesiology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, P.R China