1. Department of Urology, Faculty of Medicine, Medical Center–University of Freiburg, Freiburg, Germany.
2. Institute of Medical Microbiology and Hygiene, Faculty of Medicine, Medical Center–University of Freiburg, Freiburg, Germany.
3. Laboratory for Chemistry and Physics of Interfaces, Department of Microsystems Engineering (IMTEK), University of Freiburg, Freiburg, Germany.