1. Medical Faculty of the Humboldt University at Berlin, Charité, Campus Mitte; Department of General-, Visceral-, Vascular- and Throacic Surgery; Schumannstrasse 20/21 Berlin Germany 10117
2. Medical Faculty of the Humboldt-University at Berlin, Charité, Campus Mitte; Department of General-, Visceral-, Vascular- and Thoracic Surgery; Schumannstrasse 20/21 Berlin Germany 10117
3. University of Berlin; Klinik fuer Allgemein-, Viszeral-, Gefäß- und Thoraxchirurgie; Schumannstrasse 20/21 Berlin Germany 10117
4. University of Berlin; Department of General, Visceral, Vascular, and Thoracic Surgery; Schumannstrasse 20/21 Berlin Germany 10117