1. Department of Gastroenterology, General Hospital of Northern Theater Command, Shenyang, P.R. China
2. Postgraduate College, Shenyang Pharmaceutical University, Shenyang, P.R. China
3. CRC “A.M. e A. Migliavacca” Center for the Study of Liver Disease, Division of Gastroenterology and Hepatology, Fondazione IRCCS Ca’ Granda - Ospedale Maggiore Policlinico Università degli Studi di Milano Via F., Milan, Italy
4. Postgraduate College, Jinzhou Medical University, Jinzhou, P.R. China