1. Federal Institute for Drugs and Medical Devices (BfArM); Kurt-Georg-Kiesinger-Allee 3 Bonn Germany 53175
2. University Hospital of Cologne; Cochrane Haematological Malignancies Group, Department I of Internal Medicine; Kerpener Str. 62 Cologne Germany 50924
3. University Hospital of Cologne; Department I of Internal Medicine; Kerpener Str. 62 Cologne Germany 50924
4. University of Bern; Institute of Social and Preventive Medicine; Finkenhubelweg 11 Bern Switzerland 3012