1. Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
2. Department of Infection Control, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, China
3. Department of Anesthesiology, Sichuan Cancer Center, Sichuan Cancer Hospital & Institute, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China