1. Departments of Urology, Helios-Klinik Müllheim (TF), Müllheim and SLK-Kliniken Heilbronn, University of Heidelberg (DT, JR), Heilbronn, Germany, Departments of Urology (TE) and Biostatistics (HG), Faculty of Medicine, Akdeniz University, Antalya, Turkey, and Department of Urology (DZ), Michigan State University, East Lansing, Michigan