1. German Hodgkin Study Group (GHSG) Department of Internal Medicine 1 University Hospital Cologne CologneGermany
2. Haematology Oncology University Hospital Frankfurt FrankfurtGermany
3. Haematology Oncology University Hospital Saarland HomburgGermany
4. Haematology Oncology University Hospital Ulm UlmGermany
5. Haematology Oncology University Hospital Regensburg RegensburgGermany
6. Haematology Oncology University Hospital Tübingen Tübingen Germany