1. Bayer AG, Biomarker Research, 13353 Berlin, Germany
2. Current/Present address: JPT Peptide Technologies GmbH, 12489 Berlin, Germany
3. Department of General, Visceral and Pediatric Surgery, Medical Faculty, University Hospital of the Heinrich-Heine-University Duesseldorf, 40225 Duesseldorf, Germany
4. Institute of Pathology, Heinrich-Heine-University of Duesseldorf, 40225 Duesseldorf, Germany
5. Current/Present address: University Medical Center Hamburg-Eppendorf, Department of Tumor Biology, 20246 Hamburg, Germany
6. Institute of Pharmaceutical & Medicinal Chemistry, University of Duesseldorf, 40225 Duesseldorf, Germany