1 Department of Anesthesiology, West China Hospital, Sichuan University/West China School of Nursing, Sichuan University, China.
2 Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, Sichuan, China.
3 Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, Sichuan, China. Electronic address: pdasonghaibo@163.com.
4 Nursing Key Laboratory of Sichuan Province, National Clinical Research Center for Geriatrics, and Science and Technology Department, West China Hospital, Sichuan University, Chengdu, China. Electronic address: kittyanwang520@scu.edu.cn.