1. Columbia University Medical Center, New York, New York, USA
2. Unit of Experimental Endoscopy, Medical Department I, University Hospital Schleswig-Holstein, Kiel, Germany
3. Institute for Animal Breeding, Friedrich-Löffler Institute, Mariensee, Germany
4. Department of Pathology, Veterinarian University Medical School, Hannover, Germany
5. Institue of Pathology, Hemapathology Section and lymph Node Registry, University Hospital Schleswig-Holstein, Kiel, Germany
6. Department of Surgery, Hammersmith Hospital, London, United Kingdom