1. 1First Department of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Dusseldorf, University of Cologne, Cologne, Germany
2. 2German Hodgkin Study Group, University Hospital Cologne, Cologne, Germany
3. 3Department of Radiation Oncology, University of Cologne, Cologne, Germany
4. 4Department of Nuclear Medicine, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
5. 5Salzburg Cancer Research Institute, Center for Clinical Cancer and Immunology Trials, Cancer Cluster Salzburg, Austrian Group for Medical Tumor Therapy, Paracelsus Medical University, Salzburg, Austria
6. 6Department of Medical Oncology, Oncology Institute of Southern Switzerland, Bellinzona, Switzerland
7. 7Swiss Group for Clinical Cancer Research, Bern, Switzerland
8. 8Department of Hematology, Amsterdam UMC, Vrije universiteit, Cancer Center Amsterdam, Amsterdam, The Netherlands
9. 9Department of Internal Medicine I, Klinikum Bremen-Mitte, Bremen, Germany
10. 10Second Department of Internal Medicine, University Hospital Würzburg, Würzburg, Germany
11. 11Onkologische Schwerpunktpraxis Bielefeld, Bielefeld, Germany
12. 12Department of Hematology and Stem Cell Transplantation, University Hospital Essen, University Duisburg-Essen, German Cancer Consortium (DKTK partner site Essen), Essen, Germany
13. 13Department of Radiotherapy, University Hospital Münster, Münster, Germany
14. 14Dr. Senckenberg Institute of Pathology, Goethe University Frankfurt, Frankfurt am Main, Germany