1. Department of Gastroenterology, The Second Hospital of Hebei Medical University, Hebei Key Laboratory of Gastroenterology, Hebei Institute of Gastroenterology, Shijiazhuang, Hebei 23000, China
2. School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong
3. Croucher Laboratory for Human Genomics, The Chinese University of Hong Kong, Shatin, Hong Kong