1 State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Hong Kong, People's Republic of China wukakei@cuhk.edu.hk.
2 Department of Anaesthesia and Intensive Care and Peter Hung Pain Research Institute, The Chinese University of Hong Kong, Hong Kong, People's Republic of China.
3 Institute of Digestive Disease, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong, People's Republic of China.
4 Centre for Gut Microbiota Research, The Chinese University of Hong Kong, Hong Kong, People's Republic of China.