1. Dr. Senckenberg Institute of Pathology; Goethe University; Frankfurt am Main Germany
2. First Department of Internal Medicine; University Hospital of Cologne; Cologne Germany
3. German Hodgkin Study Group; University Hospital of Cologne; Cologne Germany
4. Institute of Pathology; University of Würzburg and Comprehensive Cancer Center (CCC) Mainfranken; Würzburg Germany
5. Pathodiagnostic Berlin; Berlin Reference Centre for Lymphoma and Haematopathology; Berlin Germany
6. Institute of Pathology; Haematopathology Section and Lymph Node Registry; Universitätsklinikum Schleswig-Holstein; Kiel Germany
7. Institute of Pathology; Universitätsklinikum Schleswig-Holstein; Lübeck Germany
8. Institute of Pathology; Kantonsspital St. Gallen; St. Gallen Switzerland
9. Institute of Pathology; Charité University Hospital; Berlin Germany
10. Department of Clinical Pathology; Robert-Bosch-Krankenhaus; Dr Margarete Fischer-Bosch Institute of Clinical Pharmacology; Stuttgart Germany
11. Institute of Pathology; University Hospital Ulm; Ulm Germany