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In health research, one of the major tasks is to retrieve and analyze heterogeneous databases containing one single patient's information gathered from a large volume of data over a long period of time. The main objective of this paper is to represent the authors' ontology-based information retrieval approach for clinical information system. They have performed a case study in the real life hospital settings. The results obtained illustrate the feasibility of the proposed approach which significantly improved the information retrieval process on a large volume of data over a long period of time from August 2011 until January 2012.
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