1 Center for Surgery, Department of General and Visceral Surgery, Medical Center University of Freiburg, Freiburg, Germany. birte.kulemann@uniklinik-freiburg.de.
2 Faculty of Medicine, University of Freiburg, Freiburg, Germany. birte.kulemann@uniklinik-freiburg.de.
3 Center for Surgery, Department of General and Visceral Surgery, Medical Center University of Freiburg, Freiburg, Germany.
4 Faculty of Medicine, University of Freiburg, Freiburg, Germany.
5 Institute for Surgical Pathology, Medical Center University of Freiburg, Freiburg, Germany.
6 Comprehensive Cancer Center, Medical Center University of Freiburg, Freiburg, Germany.
7 Center of Medicine, Department of Medicine I, Medical Center University of Freiburg, Freiburg, Germany.
8 Department of Pathology & Andrew L. Warshaw, MD Institute for Pancreatic Cancer Research, Massachusetts General Hospital/ Harvard Medical School, Boston, MA, USA.