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Substance Use Class Code
A character or string that represents a substance use class. (NCI Thesaurus)
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The variable assigned to a substance usage class.
A classification scheme based on the use of a particular material or product.
A point in time that indicates the beginning of substance usage.
An indication or description of the start of substance usage in relation to a specific point in time.
The date on which the substance usage begins.
An indication or description that substance usage was previously determined, characterized, or detailed.
