MALDI imaging mass spectrometry for in situ proteomic analysis of preneoplastic lesions in pancreatic cancer. oleh Barbara M Grüner, Hannes Hahne, Pawel K Mazur, Marija Trajkovic-Arsic, Stefan Maier, Irene Esposito, Evdokia Kalideris, Christoph W Michalski, Jörg Kleeff, Sandra Rauser, Roland M Schmid, Bernhard Küster, Axel Walch, Jens T Siveke