1. Department of Anesthesiology, Harbin Orthopedics Surgery Hospital, Harbin City, Heilongjiang Province, China
2. Department of Anesthesiology, Nanchong Central Hospital, Nanchong City, Sichuan Province, China
3. Department of Pain, Beijing Xuanwu Hospital, Capital Medical University, Beijing, China
4. Department of Anesthesiology, Cancer Hospital of Harbin Medical University, Harbin City, Heilongjiang Province, China