1 Department of General and Visceral Surgery, St. Josef-Hospital, Ruhr-University Bochum, Gudrunstr. 56, 44791, Bochum, Germany. a.luu@klinikum-bochum.de.
2 Department of General and Visceral Surgery, St. Josef-Hospital, Ruhr-University Bochum, Gudrunstr. 56, 44791, Bochum, Germany.
3 Institute of Pathology, University-Hospital Bergmannsheil, Ruhr-University Bochum, Buerkle de la Camp Platz 1, 44789, Bochum, Germany.