Towards Retrieving Relevant Information for Answering Clinical Comparison Questions Annette Leonhard author 2009-06 text Proceedings of the BioNLP 2009 Workshop K Bretonnel Cohen editor Dina Demner-Fushman editor Sophia Ananiadou editor John Pestian editor Jun’ichi Tsujii editor Bonnie Webber editor Association for Computational Linguistics Boulder, Colorado conference publication leonhard-2009-towards https://aclanthology.org/W09-1320/ 2009-06 153 161