1. Department of Medicine, Rhode Island Hospital and Warren Alpert School of Medicine of Brown University, Providence, RI, USA
2. Dartmouth-Hitchcock Gastroenterology and Hepatology, Lebanon, NH, USA
3. Division of Surgical Pathology/Gastrointestinal and Liver Pathology, University of Massachusetts, Boston, MA, USA
4. Division of Gastroenterology, Rhode Island Hospital and Warren Alpert Medical School of Brown University, Providence, RI, USA