1. University Hospital of Cologne; Cochrane Haematological Malignancies Group, Department I of Internal Medicine; Kerpener Str. 62 Cologne Germany 50924
2. German Cochrane Center; Department of Medical Biometry and Statistics; University Medical Center Stefan-Meier-Str. 26 Freiburg Germany D-79104
3. University Hospital of Cologne; Department I of Internal Medicine, Center of Integrated Oncology Köln Bonn; Kerpener Str. 62 Cologne Germany 50924
4. Carl Schurz Strasse 8 Cologne Germany 50935