1. Department for Surgical Research; University Hospital Essen; University Duisburg-Essen; Essen Germany
2. Surgical Research Division; University Clinic of Surgery; Bonn Germany
3. Clinic for Infectiology University Hospital Essen; University Duisburg-Essen; Essen Germany
4. Department of General; Visceral and Transplantation Surgery; University Hospital Essen; University Duisburg-Essen; Essen Germany