1 Department of Anesthesiology, Guangdong Cardiovascular Institute & Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China.
2 College of Medicine, Shantou University, Shantou, China.
3 Department of Operation Room, Guangdong Cardiovascular Institute & Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China.
4 Department of Anesthesiology, Linzhi People's Hospital, Linzhi, China.