1. Department I of Internal Medicine; University Hospital of Cologne; Cologne Germany
2. German Hodgkin Study Group (GHSG); Cologne Germany
3. Department of Radiation Oncology; University Hospital Münster; Münster Germany
4. Department of Radiation Oncology; University Hospital of Cologne; Cologne Germany
5. Department of Nuclear Medicine; University Hospital of Cologne; Cologne Germany
6. Department III of Internal Medicine; Krankenhaus Düren; Düren Germany
7. Department II of Internal Medicine; University Hospital of Frankfurt; Frankfurt Germany
8. Pathodiagnostik Berlin; Berlin Germany