Joseph R. Pisegna, MD
Professor of Medicine
Division of Gastroenterology, Hepatology, and Parenteral Nutrition
David Geffen School of Medicine at University of California
VA Greater Los Angeles Healthcare System
Department of Veterans Affairs
JRP is an author of a number of references cited in this topic.
Dr Joseph R. Pisegna would like to gratefully acknowledge Dr Deepinder Goyal, Dr Jihane Benhammou, Dr David Oh, and Dr Hank Wang, previous contributors to this topic. DG, JB, DO, and HW declare that they have no competing interests.
Peter Draganov, MD
Associate Professor of Medicine Division
Gastroenterology, Hepatology and Nutrition
University of Florida
PD declares that he has no competing interests.
Petros Perros, BSc, MBBS, MD, FRCP
Newcastle-Upon-Tyne Hospitals Trust
PP declares that he has no competing interests.