1. Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan 430061, Hubei Province, China
2. Department of Gastroenterology, The Affiliated Hospital of Guizhou Medical University, Guiyang 550004, Guizhou Province, China
3. Department of Pathology, Renmin Hospital of Wuhan University, Wuhan 430061, Hubei Province, China