Inter-observer agreement for the histological diagnosis of invasive lobular breast carcinoma Ghent University KU Leuven Vrije Universiteit BrusselMatthias Christgen, Leonie Donata Kandt, Wiebke Antonopoulos, Stephan Bartels, Mieke R. Van Bockstal, Martin Bredt, Maria Jose Brito, Henriette Christgen, Cecile Colpaert, Balint Cserni, et al.