1 Department of Anaesthesiology, Wusong Hospital Branch, Zhongshan Hospital Affiliated to Fudan University, Shanghai, China.
2 Department of Anaesthesiology, Shanghai Sixth People's Hospital East Affiliated to Shanghai University of Medicine and Health Sciences, Shanghai, China.
3 Department of Anaesthesiology, Shanghai Sixth People's Hospital East Affiliated to Shanghai University of Medicine and Health Sciences, Shanghai, China. Electronic address: fankunmazui@hotmail.com.