1. Department of Medicine, Division of Gastroenterology and Hepatology, University of Massachusetts, Worcester, Massachusetts, USA
2. Department of Medicine, Division of Gastroenterology & Hepatology, University of California San Francisco, San Francisco, California, USA
3. Department of Organ Transplant, Division of Gastroenterology and Hepatology, Scripps Clinic, La Jolla, California, USA
4. Department of Medicine and Public Health Sciences, Queen’s University, Ontario, Canada
5. Department of Transplant Surgery, Ronald Regan UCLA Medical Center, Los Angeles, California, USA
6. Department of Medicine, Division of Gastrointestinal and Liver Diseases, Keck School of Medicine of USC, Los Angeles, California, USA
7. Department of Medicine, Division of Gastroenterology, Duke University School of Medicine, Durham, North Carolina, USA
8. Department of Medicine, Division of Gastroenterology and Hepatology, Indiana University School of Medicine, Indianapolis, Indiana, USA
9. Department of Surgery, Division of Abdominal Organ Transplantation, Oregon Health & Science University School of Medicine, Portland, Oregon, USA
10. Department of Medicine, Division of Gastroenterology and Liver, Keck School of Medicine of USC, Los Angeles, California, USA
11. Department of Gastroenterology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
12. Departments of Medicine and Pediatrics, University of Chicago, Chicago, Illinois, USA
13. Department of Medicine, University of Chicago, Chicago, Illinois, USA
14. Dipartimento di Specialità Mediche, Struttura Complessa di Gastroenterologia, Universita Degli Studi Di Modena E Reggio Emilia, Modena, Italy