1. Department of Surgery; Prince of Wales Hospital; Shatin New Territories Hong Kong
2. Institute of Chinese Medicine and State Key Laboratory of Phytochemistry and Plant Resources in West China (CUHK); Shatin New Territories Hong Kong
3. School of Biomedical Sciences; The Chinese University of Hong Kong; Shatin New Territories Hong Kong
4. Department of Medicine and Therapeutics and State Key Laboratory of Digestive Disease; The Chinese University of Hong Kong; Shatin New Territories Hong Kong