1. Medical Division; Clinical Trials Center Cologne; Herderstrasse 52 Cologne Germany 50931
2. University Hospital of Cologne; Department of Internal Medicine 1, Center of Integrated Oncology Köln Bonn; Kerpener Str. 62 Cologne Germany 50924
3. University Hospital of Cologne; Cochrane Haematological Malignancies Group, Department I of Internal Medicine; Kerpener Str. 62 Cologne Germany 50924
4. University Hospital of Cologne; Department I of Internal Medicine; Kerpener Str. 62 Cologne Germany 50924