1. Department of Surgery (A), Heinrich-Heine-University and University Hospital Duesseldorf, D-40225 Duesseldorf, Germany
2. Institute of Pathology, Heinrich-Heine-University and University Hospital Duesseldorf, D-40225 Duesseldorf, Germany
3. Department of Diagnostic and Interventional Radiology, Medical Faculty, University Duesseldorf, D-40225 Duesseldorf, Germany