1. Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Ruhr University Bochum (IPA), Bürkle-de-la-Camp Platz 1, 44789 Bochum, Germany
2. Medizinisches Proteom-Center, Medical Faculty, Ruhr-University Bochum and Medical Proteome Analysis, Center for Protein Diagnostics (PRODI), Gesundheitscampus 4, 44081 Bochum, Germany
3. Department of Urology, Marien Hospital Herne, University Hospital of the Ruhr University Bochum, Hölkeskampring 40, 44625 Herne, Germany