1. Viktor Grünwald, MD, Interdisciplinary Genitourinary Oncology at the West-German Cancer Center, Clinic for Internal Medicine (Tumor Research) and Clinic for Urology, University Hospital Essen, Germany; Xiaofei Liu, MSc, Institute for Biostatistics, Medical School Hanover, Hanover, Germany; Markus Schuler, MD, Helios Clinic, Berlin, Germany; and Sebastian Bauer, MD, Clinic for Internal Medicine (Tumor Research), University Hospital Essen, Germany