1. Division of Gastroenterology and Hepatology; Department of Medicine; Center for Esophageal Diseases and Swallowing; University of North Carolina School of Medicine; Chapel Hill; NC; USA
2. Division of Allergy and Immunology; Department of Pediatrics; Virginia Commonwealth University Medical Center; Richmond; VA; USA
3. Meritage Pharma, Inc; San Diego; CA; USA
4. Division of Gastroenterology and Hepatology; Department of Medicine; Northwestern University Feinberg School of Medicine; Chicago; IL; USA