1. Teaching Office, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, China
2. Department of Pathology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, China
3. Out-Patient Office, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, China
4. Department of Gastroenterology, Xi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Xi’an, Shaanxi Province, China
5. Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, China