1. Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, USA
2. Department of Gastroenterology, Nan Fang Hospital, Southern Medical University, Guangzhou, China
3. Department of Gastroenterology, Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
4. Bristol-MyersSquibb, Princeton, New Jersey, USA
5. Department of Pharmacology and Toxicology, University of Texas Medical Branch, Galveston, USA
6. Department of Pathology, University of Texas Medical Branch, Galveston, USA