Professor of Medicine
Chief of Division of Gastroenterology
Texas Tech University Health Sciences Center
El Paso
TX
Medical Director of Gastrointestinal Endoscopy
Assistant Professor of Medicine
Division of Gastroenterology
Texas Tech University Health Sciences Center
El Paso
TX
Dr Marc J. Zuckerman and Dr Andres F. Carrion would like to gratefully acknowledge Dr. Sheila Feit and Dr. Mohamed Othman, previous contributors to this topic. SF declares that she has no competing interests. MO has acted as a consultant for Olympus.
Professor of Medicine
Chief of GI Endoscopy
Rikshospitalet University Hospital
Oslo
Norway
Consultant
Department of Internal Medicine
Copenhagen University Hospital
Hellerup
Denmark
Professor of Medicine
Department of Gastroenterology & Hepatology
Center for Swallowing & Esophageal Disorders
Cleveland Clinic
Cleveland
OH
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