1. Department of Urology; RWTH Aachen University, Pauwelsstraße 30; 52074 Aachen Germany
2. Department of Neuro-Urology; University Clinic Friedrich-Wilhelms-University Bonn and Neurologic Rehabilitation Centre Godeshöhe; Bonn Germany
3. Helmholts Institute for Biomedical Engineering; Biointerface Group, RWTH Aachen University; Aachen Germany
4. Institute of Pathology, RWTH Aachen University; Aachen Germany
5. Institute of Plastics Processing, RWTH Aachen University; Aachen Germany
6. Institute of Neuropathology, RWTH Aachen University; Aachen Germany