1. Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA;
2. Department of Gastroenterology, Kaiser Permanente, San Francisco, California, USA;
3. Department of Gastroenterology, Hepatology & Nutrition, Digestive Disease and Surgery Institute, Cleveland Clinic Foundation, Cleveland Ohio, USA;
4. Division of Gastroenterology and Hepatology, Johns Hopkins University, Baltimore, Maryland, USA;
5. Liver Transplantation Unit, King Faisal Specialist Hospital & Research Center, Riyadh, Saudi Arabia;
6. Division of Gastroenterology and Hepatology, Stanford University School of Medicine, Palo Alto, California, Gastroenterology Section, Veterans Affairs Palo Alto Healthcare System, Palo Alto, California, USA;
7. Division of Gastroenterology, UCLA, Los Angeles, California, USA;
8. Division of Gastroenterology and Hepatology, University of Washington, Seattle, Washington, USA;
9. Division of Digestive and Liver Diseases, UT Southwestern Medical Center, Dallas, Texas, USA.