title: (In)valid consent of advance directives.
authors.forename: S G
authors.initials: SG
authors.lastname: Barber
mesh_terms: D016223:Advance Directives; D000368:Aged; D000369:Aged, 80 and over; D002755:Choice Behavior; D033101:Euthanasia, Active, Voluntary; D005260:Female; D006801:Humans; D007258:Informed Consent; D016743:Mental Competency; D026684:Personal Autonomy; D011014:Pneumonia / Q000188:drug therapy / Q000523:psychology*; D016312:Treatment Refusal / Q000523:psychology*; D028761:Withholding Treatment