1Department of Radiology, Hospital of the Brothers of St. John, Esterhazystrasse 26, 7000 Eisenstadt, Austria2Department of Surgery, Hospital of the Brothers of St. John, Esterhazystrasse 26, 7000 Eisenstadt, Austria3Department of Internal Medicine, Hospital of the Brothers of St. John, Esterhazystrasse 26, 7000 Eisenstadt, Austria4Department of Medical Cybernetics and Artificial Intelligence, University of Vienna, Freyung 6/2, 1010 Vienna, Austria