Negation Scope Delimitation in Clinical Text Using Three Approaches: NegEx, PyConTextNLP and SynNeg Hideyuki Tanushi author Hercules Dalianis author Martin Duneld author Maria Kvist author Maria Skeppstedt author Sumithra Velupillai author 2013-05 text Proceedings of the 19th Nordic Conference of Computational Linguistics (NODALIDA 2013) Stephan Oepen editor Kristin Hagen editor Janne Bondi Johannessen editor Linköping University Electronic Press, Sweden Oslo, Norway conference publication tanushi-etal-2013-negation https://aclanthology.org/W13-5635/ 2013-05 387 397