1. Department of Gastroenterology, General Hospital of Northern Theater Command (formerly called General Hospital of Shenyang Military Area), Shenyang, P.R. China
2. Postgraduate College, Shenyang Pharmaceutical University, Shenyang, P.R. China
3. Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
4. Division of Gastroenterology, Vancouver General Hospital, Vancouver, British Columbia, Canada
5. Liver Research Unit, Medica Sur Clinic and Foundation and Faculty of Medicine, National Autonomous University of Mexico, Mexico
6. Department of Pharmacology, General Hospital of Northern Theater Command, (formerly called General Hospital of Shenyang Military Area), Shenyang, P.R. China