1. Department of Nuclear Medicine,
2. German Hodgkin Study Group (GHSG), Department I of Internal Medicine,
3. Department for Radiooncology and Cyberknife Center, University Hospital of Cologne, Cologne, Germany;
4. Department of Hematology, Cancer Center Amsterdam and
5. Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, The Netherlands; and
6. Department I of Internal Medicine, University Hospital of Cologne, Cologne, Germany