1. University Hospital Bonn, Medical Clinic 1, Section for Nephrology and University Bonn , Germany
2. University Duisburg-Essen, University Hospital Essen, Institute of Experimental Immunology and Imaging, Department of Immunodynamics , Essen , Germany
3. University of Münster, Institute of Hygiene, Münster , Germany
4. University Hospital Bonn and University Bonn , Germany
5. Medical Faculty of Mannheim University of Heidelberg, Institute for Medical Microbiology and Hygiene , Heidelberg , Germany
6. Medical Faculty of Mannheim, Heidelberg University, Institute for Medical Microbiology and Hygiene , Mannheim , Germany
7. Justus-Liebig University Giessen, Clinic for Urology, Paediatric Urology and Andrology, Giessen , Germany