1. Center for Esophageal Diseases and Swallowing; University of North Carolina School of Medicine; Chapel Hill North Carolina USA
2. Center for Gastrointestinal Biology and Disease; Division of Gastroenterology and Hepatology; Department of Medicine; University of North Carolina School of Medicine; Chapel Hill North Carolina USA
3. Carolina Data Warehouse, North Carolina Translational and Clinical Sciences Institute; University of North Carolina; Chapel Hill North Carolina USA