Affiliation: | 1. Department of Gastrointestinal Surgery, China‐Japan Union Hospital of Jilin University, Changchun, Jilin, P.R. China;2. Department of Medicine, Liver and Biliary Disease Hospital of Jilin Province, Changchun, P.R. China;3. Department of Endoscopy Center, China‐Japan Union Hospital of Jilin University, Changchun, Jilin, P.R. China |