@inproceedings{Niu:2006:AMIA,
     title = "Using Outcome Polarity in Sentence Extraction for Medical Question-Answering",
     author = "Niu, Yun and Zhu, Xiaodan and Hirst, Graeme",
     year = "2006",
     booktitle = "Proceedings of the Annual Symposium of the American Medical Informatics Association",
     location = "Washington, D.C., USA"
}