1. University Hospital of Cologne; Cochrane Haematological Malignancies Group, Department I of Internal Medicine; Kerpener Str. 62 Cologne Germany
2. University of Cologne; Institute of Medical Statistics and Computational Biology; Kerpener Str. 62 Cologne Germany 50937
3. University Hospital of Cologne; Institute of Medical Statistics and Computational Biology; Kerpener Str. 62 Cologne Germany 50937
4. University Hospital of Cologne; Department of Urology; Kerpener Str. 62 Cologne Germany 50937