1 Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China; Department of Cardiovascular Surgery, West China Hospital, Sichuan University, Chengdu, China.
2 West China School of Medicine, Sichuan University, Chengdu, China.
3 Department of Cardiovascular Surgery, West China Hospital, Sichuan University, Chengdu, China. Electronic address: gujun@wchscu.cn.