Division of Gastroenterology, Northwestern University Feinberg School of Medicine,
Chicago, IL
Center for Esophageal Diseases and Swallowing, Division of Gastroenterology and Hepatology,
University of North Carolina School of Medicine, Chapel Hill, NC
Division of Gastroenterology, Center for Esophageal Diseases, Baylor University Medical
Center at Dallas and Center for Esophageal Research, Baylor Scott & White Research
Institute, Dallas, TX
Division of Gastroenterology, University of Colorado School of Medicine, Denver, CO