1. Department of Pathology, Hematopathology Section and Lymph Node Registry, University Hospital Schleswig-Holstein, Campus Kiel, Kiel;
2. Department of Internal Medicine III, University of Munich, Munich;
3. Department of Pathology, University of Würzburg, Würzburg;
4. Department of Clinical Pathology, Robert-Bosch-Krankenhaus, Stuttgart;
5. Department of Pathology, University Hospital Schleswig-Holstein, Campus Lübeck, Lübeck;
6. Department of Pathology, University Hospital Charité, Campus Benjamin-Franklin, Berlin;
7. Department of Pathology, University of Frankfurt, Frankfurt; and
8. Department of Pathology, University of Ulm, Ulm, Germany