1. Laboratory for Interventional and Experimental Endoscopy, University of Würzburg, Würzburg, Germany
2. Department of General and Visceral Surgery, St. Elisabethen Krankenhaus, Frankfurt, Germany
3. AGAPLESION Markus Krankenhaus, Department of General and Visceral Surgery, Frankfurt, Germany
4. University of Cologne, Department of General-, Visceral-and Cancer Surgery, Cologne, Germany
5. University of Würzburg, Zentrum Innere Medizin, Head of Gastroenterology, Würzburg, Germany