1] Institute of Digestive Disease, The Chinese University of Hong Kong, Hong Kong, China [2] Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong, China. Department of Clinical Oncology, The Chinese University of Hong Kong, Hong Kong, China. Department of Imaging and Interventional Radiology, The Chinese University of Hong Kong, Hong Kong, China. Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong, China. 1] Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong, China [2] Centre for Nutritional Studies, The Chinese University of Hong Kong, Hong Kong, China. Department of Chemical Pathology, The Chinese University of Hong Kong, Hong Kong, China. 1] Institute of Digestive Disease, The Chinese University of Hong Kong, Hong Kong, China [2] Department of Imaging and Interventional Radiology, The Chinese University of Hong Kong, Hong Kong, China.