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In Richesson et al., Data Standards in Clinical Research: Gaps, Overlaps, Challenges, and Future Directions, JAMIA 2007; Volume 14 Number 6, November/December 2007, reference 38 was not complete. The correct reference follows below.
Campbell KE, Oliver DE, Spackman KA, Shortliffe EH. Representing thoughts, words, and things in the UMLS. J Am Med Inform Assoc 1998;14(5):421-431.
