| http://www.w3.org/ns/prov#value | - Drug use frequency underreporting appears substantial, and might constitute an important threat to the validity of some treatment outcome evaluations, needs assessments and other analyses that rely on drug use frequency self-reports.PMID: 10661670 [PubMed - indexed for MEDLINE] SharePublication Types, MeSH Terms, Substances, Grant SupportPublication TypesResearch Support, Non-U.S. Gov'tResearch Su
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