1. Institute of Pathology, University of Cologne, Kerpener Str. 62 50937, Germany
2. Department of General, Visceral, Thoracic and Vascular Surgery, University of Bonn, Venusberg Campus 1, 53127 Bonn, Germany
3. Institute of Pathology, University of Bonn, Venusberg Campus 1, 53127 Bonn, Germany
4. Institute of Pathology and Hematopathology Hamburg, Fangdieckstraße 75a, 22547 Hamburg, Germany
5. Institute of Pathology Troisdorf, Mendener Str. 12, 53840 Troisdorf, Germany