1. Center for Endoscopic Research and Therapeutics, Section of Gastroenterology, University of Chicago Medicine, Chicago, Illinois, USA
2. Department of Medicine II Klinikum rects der Isar, Technical University of Munich, Munich, Germany
3. Section of Gastroenterology, Cedars-Sinai Medical Center, Los Angeles, California, USA
4. Endoscopy Unit, Paoli-Calmettes Institute, Marseille, France
5. Department of Gastroenterology, Mayo Clinic Florida, Jacksonville, Florida, USA
6. Division of Gastroenterology, University of Washington, Seattle, Washington, USA
7. Division of Gastroenterology, University of California, Irvine, Los Angeles, California, USA
8. Section of Gastroenterology, Yale University, New Haven, Connecticut, USA
9. Department of Pathology, University of Chicago Medicine, Chicago, Illinois, USA
10. Department of Health Studies, University of Chicago, Chicago, Illinois, USA