1. Department of Pathology, University of Iowa Hospitals and Clinics; University of Iowa Carver College of Medicine; Iowa City Iowa
2. Department of Clinical and Experimental Medicine; Gastroenterology Unit; University “Federico II” Naples Italy
3. Sect Gastroenterology, Ege Reflux Study Group; Ege University School of Medicine; Bornova Turkey
4. Translational Research Center for Gastrointestinal Disorders; KU Leuven Leuven Belgium
5. Department of Medicine I; University of Erlangen-Nuremberg; Erlangen Germany
6. Institute of Pathology; Klinikum Bayreuth Bayreuth Germany
7. Cancer Research Program; JLC-BBRI, North Carolina Central University; Durham North Carolina
8. Division of Gastroenterology and Hepatology, Department of Medicine, Center for Esophageal Diseases and Swallowing; University of North Carolina; Chapel Hill North Carolina