Haferkamp A1, Krengel U 1, Reitz A2, Grosse J3, Kramer G3, Schumacher S1, Schurch B2, Stöhrer M3, Müller S C1 1. Dept. of Urology, University of Bonn, Germany, 2. Dept. of Neurourology, Swiss Paraplegia Center, University Hospital Balgrist, Zurich, Switzerland, 3. Dept. of Urology, Berufsgenossenschaftliche Unfallklinik, Murnau, Germany