Rüdiger Schmitz1, Jenny Krause2, Till Krech3, Thomas Rösch4. 1. Institute of Anatomy and Experimental Morphology, Center for Experimental Medicine, University Hospital Hamburg-Eppendorf, Hamburg, Germany. 2. I. Department of Internal Medicine, Center for Internal Medicine, University Hospital Hamburg-Eppendorf, Hamburg, Germany. 3. Institute of Pathology, Center for Diagnostics, University Hospital Hamburg-Eppendorf, Hamburg, Germany. 4. Department of Interdisciplinary Endoscopy, Center for Radiology and Endoscopy, University Hospital Hamburg-Eppendorf, Hamburg, Germany. Electronic address: t.roesch@uke.de.