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Both RxNorm and WHO/ATC have terms to cover cases in which two or more individual drugs are combined into a single formulation (pill, solution, inhaler etc.) so that they can be easily administered together.  It is better to ignore these combination terms and annotate the individual components using AND. 

Non-drug interventions

Terms for all non-drug interventions are drawn from SNOMED CT.  As with P, we have included only selected subsets of this vocabulary.  

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