1. Department of General Surgery, First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154002, P.R. China
2. Department of Interventional Radiology, First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154002, P.R. China
3. Department of Anesthesiology, First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154002, P.R. China