1. Clinic for General, Visceral and Pediatric Surgery, University Medical Center Göttingen, Georg-August-University of Göttingen, D-37077 Göttingen, Germany
2. Institute for Tumor Biology, University Medical Center-Hamburg-Eppendorf, D-20251 Hamburg, Germany
3. Center for Diagnostics, University Medical Center Hamburg-Eppendorf, D-20251 Hamburg, Germany
4. Pharmaceutical Institute, Christian-Albrechts-University Kiel, D-24118 Kiel, Germany
5. Dermatology and Venerology Department and Clinic, University Medical Center Hamburg-Eppendorf, D-20251 Hamburg, Germany
6. Institute for Experimental Immunology and Hepatology, University Medical Center Hamburg-Eppendorf, D-20251 Hamburg, Germany
7. Goodman Cancer Research Centre and Departments of Biochemistry, Medicine and Oncology, McGill University, Montreal, H3G1Y6, Canada