1 Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, China. mtvchan@cuhk.edu.hk.
2 Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, China.
3 State Key Laboratory of Digestive Disease, Department of Medicine & Therapeutics and LKS Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, China.
4 Institute of Digestive Disease, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, China.