1. Wenlei Mao, Wesley W. Chu, Free-text medical document retrieval via phrase-based vector space model, in: Proceedings of the Annual AMIA Symposium, San Antonio, TX, November 2002, pp. 489–493.
2. NLM. PubMed overview, 2003. Available from: .
3. US National Library of Medicine. NLM Gateway, 2003. Available from: .
4. ASTM International Subcommittee E31.19. E1384-02a standard guide for content and structure of the electronic health record (EHR), 2003. Available from: .
5. Medical Records Institute. Fourth annual MRI survey of electronic health record trends and usage, 2002. Available from: .