1. Department of Hematology, Hemostasis, Oncology & Stem Cell Transplantation, Hannover Medical School, Hannover, Germany
2. Department of Nephrology, Hannover Medical School, Hannover, Germany
3. Department of Urology & Urologic Oncology, Hannover Medical School, Hannover, Germany
4. Interdisciplinary Genitourinary Oncology at the West-German Cancer Center, Clinic for Internal Medicine (Tumor Research) & Clinic for Urology, Essen University Hospital, Essen, Germany