1. Department of Gastroenterology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
2. Postgraduate College, Kunming Medical University, Kunming, China
3. Department of Clinical Experimental Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
4. Department of Microbiology, Guangxi Medical University, Nanning, China
5. Postgraduate College, Guangxi Medical University, Nanning, China