Extracting Causal Knowledge from a Medical Database Using Graphical Patterns Christopher S G Khoo author Syin Chan author Yun Niu author 2000-10 text Proceedings of the 38th Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics Hong Kong conference publication khoo-etal-2000-extracting 10.3115/1075218.1075261 https://aclanthology.org/P00-1043/ 2000-10 336 343