1 Department of Anaesthesia and Intensive Care, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China. mtvchan@cuhk.edu.hk.
2 Department of Anaesthesia, Pamela Youde Nethersole Eastern Hospital, Chai Wan, Hong Kong SAR, China.
3 Department of Anaesthesia and Intensive Care, Tuen Mun Hospital, Tuen Mun, New Territories, Hong Kong SAR, China.
4 Department of Anaesthesia and Intensive Care, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
5 State Key Laboratory of Digestive Disease, Department of Medicine & Therapeutics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.