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@ -17,7 +17,7 @@ Concepts can represent broad categories (like “Cardiovascular disease”), det
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Records in the Standardized Vocabularies tables are derived from national or international vocabularies such as SNOMED-CT, RxNorm, and LOINC, or custom Concepts defined to cover various aspects of observational data analysis. For a detailed description of these vocabularies, their use in the OMOP CDM and their relationships to each other please refer to the [specifications](http://www.ohdsi.org/web/wiki/doku.php?id=documentation:vocabulary).
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Field|Required|Type|Description
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-----|--------|----|-----------
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:-----|:--------|:----|:-----------
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|concept_id|Yes|integer|A unique identifier for each Concept across all domains.|
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|concept_name|Yes|varchar(255)|An unambiguous, meaningful and descriptive name for the Concept.|
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|domain_id|Yes|varchar(20)|A foreign key to the [[documentation:cdm:domain|DOMAIN]] table the Concept belongs to.|
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