1. Department of Nuclear Medicine, University of Cologne, Cologne, Germany;
2. German Hodgkin Study Group, University of Cologne, Cologne, Germany;
3. Department of Clinical Hematology, Third Faculty of Medicine, Charles University, Prague, Czech Republic;
4. Schweizer Arbeitsgruppe für Klinische Krebsforschung, Bern, Switzerland;
5. Klinik für Strahlenheilkunde, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, Berlin, Germany;
6. Department of Nuclear Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany;
7. Department of Nuclear Medicine, Hanover University Medical School, Hanover, Germany;
8. Department of Hematology, VU University Medical Centre, Amsterdam, The Netherlands;
9. Department of Nuclear Medicine, University of Duisburg-Essen, Essen, Germany;
10. Department of Nuclear Medicine, University Hospital Muenster, Muenster, Germany;
11. Department of Nuclear Medicine, University of Wuerzburg, Wuerzburg, Germany;
12. Department of Nuclear Medicine, Gutenberg University Hospital, Mainz, Germany;
13. Department of Nuclear Medicine, University of Tuebingen, Tuebingen, Germany;
14. Department of Radiation Oncology, University of Cologne, Cologne, Germany; and
15. Department I of Internal Medicine, University of Cologne, Cologne, Germany