Licensees of the UMLS Metathesaurus have access to the Systematized Nomenclature of Medicine Clinical Terms, generally known as SNOMED CT (owned and maintained by the International Health Terminology Standards Development Organisation in Denmark), which is a multilingual terminology developed to retrieve and code clinical information reliably from EMRs (Cornet and de Keizer 2008).
These various classification schemes often do not overlap, necessitating methods such as the UMLS Metathesaurus for cross-walking concepts and terms (Pathak et al.
To overcome these difficulties, the UMLS Metathesaurus  was used to achieve translation of the patient data (see section 4).
For both approaches, the use of the UMLS Metathesaurus (subsection 4.
One of the four knowledge sources for the UMLS is the UMLS Metathesaurus, a "uniform, integrated distribution format for more than 30 biomedical vocabularies and classifications" (National Library of Medicine, 1997).
Using computer systems, such as the National Library of Medicine's Internet Grateful Med (IGM) that incorporate the UMLS Metathesaurus in their search functions, entering the term frottage automatically maps to Frotteurism.
Apelon has assisted the National Library of Medicine in the development and maintenance of the UMLS Metathesaurus
for the past 16 years and has intimate knowledge of its structure and content.
The UMLS Metathesaurus is the source of concepts and has been found to improve the quality of the parser and to provide needed additional search terminology lacking in queries.
The UMLS Metathesaurus and Semantic Network constitute an empirically based taxonomy of biomedicine capable of linking and mapping to diverse information sources.
Apelon has worked with the NLM on the UMLS Metathesaurus for the past fifteen years.
The UMLS Metathesaurus is a significant national asset and fundamental to improving healthcare in our country," says Apelon's President Stephen Coady.
While other terminology systems limit users to one or only a few vocabularies, the new Apelon Knowledge Base brings together all major healthcare terminologies including SNOMED CT, CPT, ICD-9, ICD-10, drug vocabularies from FirstData Bank and Multum, and all vocabularies available in the NLM's UMLS Metathesaurus