1. Inform Diagnostics Irving Texas USA
2. Baylor College of Medicine Houston Texas USA
3. Center for Esophageal Diseases and Swallowing University of North Carolina School of Medicine Chapel Hill North Carolina USA
4. 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
5. Department of Laboratory Medicine and Pathology University of Minnesota Minneapolis Minnesota USA