Affiliation: | a Institute of Physiology, Christian-Albrechts-Universität, Universitätsklinikum Schleswig-Holstein, Kiel, Germany b Neuroradiology/Department of Neurosurgery, Universitätsklinikum Schleswig-Holstein, Kiel, Germany c Departments of Urology and Pediatric Urology, Universitätsklinikum Schleswig-Holstein, Kiel, Germany |