@article{xu2012feature,
  title={Feature engineering combined with machine learning and rule-based methods for structured information extraction from narrative clinical discharge summaries},
  author={Xu, Yan and Hong, Kai and Tsujii, Junichi and Eric, I and Chang, Chao},
  journal={Journal of the American Medical Informatics Association},
  pages={amiajnl--2011},
  year={2012},
  publisher={BMJ Publishing Group Ltd}
}