1. Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, Tianjin Medical University, Tianjin, China
2. Center for Computational Biology, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
3. School of Chemical Engineering and Technology, Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin, China
4. Department of Gastroenterology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
5. Center for Statistical Genetics, Departments of Public Health Sciences and Statistics, The Pennsylvania State University, Hershey, PA, USA