1. Department of Anesthesiology, Harbin Medical University Cancer Hospital, Harbin, China
2. Department of Gastroenterology and Hepatology, The Second Hospital of Harbin, Harbin, China
3. Department of Anesthesiology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, China
4. Pain Research Institute of Heilongjiang Academy of Medical, Harbin, China