1. Department of Gastroenterology and Gastrointestinal Oncology, Interdisciplinary Endoscopy, University Medical Center, Goettingen, Germany
2. Division of Gastroenterology and Hepatology, Indiana University School of Medicine, Indianapolis, USA
3. Ovesco Endoscopy AG, Tuebingen, Germany
4. Department of Gastroenterology, Associate Prof. Maiss, Forchheim, Germany
5. Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut (FLI), Federal Research Institute for Animal Health, Mariensee, Germany
6. Department of Diagnostic and Interventional Radiology, University Medical Center, Goettingen, Germany