1. University Hospital of Cologne; Cochrane Haematological Malignancies Group, Department I of Internal Medicine; Kerpener Str. 62 Cologne Germany 50937
2. Martin-Luther-University Halle-Wittenberg; Department of Internal Medicine IV; Hematology/Oncology; Halle Germany
3. University of Heidelberg; Department of Medicine V; Heidelberg Germany
4. Queen Mary Hospital; Department of Clinical Oncology; 102 Pok Fu Lam Road 1/F Professorial Block Hong Kong China
5. University Hospital Cologne; Department of Urology; Kerpener Str. 62 Cologne Germany 50937