1. German Hodgkin Study Group (GHSG), Department I of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Düsseldorf (CIO ABCD) Faculty of Medicine and University Hospital Cologne, University of Cologne Cologne Germany
2. Department of Hematology and Oncology University of Leipzig Leipzig Germany
3. Department of Internal Medicine University Hospital of Munich Munich Germany
4. German Hodgkin Study Group (GHSG), Department of Nuclear Medicine Faculty of Medicine and University Hospital Cologne, University of Cologne Cologne Germany
5. Department of Hematology and Stem Cell Transplantation, West German Cancer Center University Hospital Essen, University of Duisburg‐Essen Essen Germany