The vocabulary problem in human-system communication
Communications of the ACM
Term-weighting approaches in automatic text retrieval
Information Processing and Management: an International Journal
Exploiting a controlled vocabulary to improve collection selection and retrieval effectiveness
Proceedings of the tenth international conference on Information and knowledge management
The Journal of Machine Learning Research
Learning ontologies from natural language texts
International Journal of Human-Computer Studies
CHI '06 Extended Abstracts on Human Factors in Computing Systems
NLTK: the natural language toolkit
COLING-ACL '06 Proceedings of the COLING/ACL on Interactive presentation sessions
Understanding the efficiency of social tagging systems using information theory
Proceedings of the nineteenth ACM conference on Hypertext and hypermedia
Introduction to Information Retrieval
Introduction to Information Retrieval
Reviewing and Evaluating Automatic Term Recognition Techniques
GoTAL '08 Proceedings of the 6th international conference on Advances in Natural Language Processing
Methodological Review: What can natural language processing do for clinical decision support?
Journal of Biomedical Informatics
Music information retrieval using social tags and audio
IEEE Transactions on Multimedia - Special section on communities and media computing
Interactive information retrieval
Annual Review of Information Science and Technology
Methodological Review: Formal representation of eligibility criteria: A literature review
Journal of Biomedical Informatics
Journal of Biomedical Informatics
A practical method for transforming free-text eligibility criteria into computable criteria
Journal of Biomedical Informatics
Developing a robust part-of-speech tagger for biomedical text
PCI'05 Proceedings of the 10th Panhellenic conference on Advances in Informatics
Constructing a true LCSH tree of a science and engineering collection
Journal of the American Society for Information Science and Technology
Journal of Biomedical Informatics
eTACTS: A method for dynamically filtering clinical trial search results
Journal of Biomedical Informatics
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Clinical text, such as clinical trial eligibility criteria, is largely underused in state-of-the-art medical search engines due to difficulties of accurate parsing. This paper proposes a novel methodology to derive a semantic index for clinical eligibility documents based on a controlled vocabulary of frequent tags, which are automatically mined from the text. We applied this method to eligibility criteria on ClinicalTrials.gov and report that frequent tags (1) define an effective and efficient index of clinical trials and (2) are unlikely to grow radically when the repository increases. We proposed to apply the semantic index to filter clinical trial search results and we concluded that frequent tags reduce the result space more efficiently than an uncontrolled set of UMLS concepts. Overall, unsupervised mining of frequent tags from clinical text leads to an effective semantic index for the clinical eligibility documents and promotes their computational reuse.