Advance research directives: implementation issues.
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D016223:Advance Directives / Q000331:legislation & jurisprudence*; D000368:Aged; D002986:Clinical Trials as Topic / Q000331:legislation & jurisprudence*; D003704:Dementia / Q000188:drug therapy; D004992:Ethics, Medical; D006801:Humans; D007872:Legal Guardians; D016743:Mental Competency / Q000331:legislation & jurisprudence*