Cancer-Stellate Cell Interactions Perpetuate the Hypoxia-Fibrosis Cycle in Pancreatic Ductal Adenocarcinoma oleh Mert Erkan, Carolin Reiser-Erkan, Christoph W. Michalski, Stefanie Deucker, Danguole Sauliunaite, Sylvia Streit, Irene Esposito, Helmut Friess, Jörg Kleeff