1. Institute of Pathology, University of Luebeck, University Hospital Schleswig-Holstein, Campus Luebeck, Ratzeburger Allee 160, 23538 Luebeck, Germany
2. Department of Radiation Oncology, University of Luebeck, University Hospital Schleswig-Holstein, Campus Luebeck, Ratzeburger Allee 160, 23538 Luebeck, Germany
3. Department of Otorhinolaryngology, University of Luebeck, University Hospital Schleswig-Holstein, Campus Luebeck, Ratzeburger Allee 160, 23538 Luebeck, Germany
4. Pathology, Research Center Borstel, Leibniz Lung Center, Parkallee 1-40, 23845 Borstel, Germany
5. Institute of Hematopathology & Medical Care Center Hanse Histologikum, Fangdieckstr. 75a, 22547 Hamburg, Germany