1. University Hospital of Cologne; Cochrane Haematological Malignancies Group, Department I of Internal Medicine; Kerpener Str. 62 Cologne Germany 50924
2. University of Bern; Division of Clinical Epidemiology and Biostatistics, Institute of Social and Preventive Medicine; Finkenhubelweg 11 Bern Switzerland CH-3012
3. Smiling Press Productions; 3 Ulm Street Scullin Australia ACT 2614
4. University Hospital of Cologne; Department I of Internal Medicine, Center of Integrated Oncology Köln Bonn; Kerpener Str. 62 Cologne Germany 50924
5. Klinikum der Universität München-Großhadern; Medizinische Klinik III; München Germany 81366
6. 2. Medizinische Klinik, Helios Klinikum Erfurt; Medical Clinic Hematology/Oncology; Nordhäuser Straße 74 Erfurt Germany 99089
7. German Cochrane Center; Department of Medical Biometry and Statistics; University Medical Center Stefan-Meier-Str. 26 Freiburg Germany D-79104