Markus F Neurath1,2,3. 1. Department of Medicine, University of Erlangen-Nuremberg, Kussmaul Campus for Medical Research, Erlangen, Germany. markus.neurath@uk-erlangen.de. 2. Deutsches Zentrum Immuntherapie (DZI), Erlangen, Germany. markus.neurath@uk-erlangen.de. 3. Ludwig Demling Endoscopy Center of Excellence, Erlangen, Germany. markus.neurath@uk-erlangen.de.