1. Department of Gastroenterology, Digestive Disease Hospital, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou 563003, P.R. China
2. Department of Burns and Plastic Surgery, Fuling Hospital, Chongqing University, Chongqing 408099, P.R. China
3. Department of Gastroenterology, Digestive Disease Hospital, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou 563003, P.R. China