title: Note on levels of clinical efficacy.
authors.affiliation: Department of Neurology, University of North Carolina School of Medicine, Chapel Hill, NC, USA. Electronic address: powersw@neurology.unc.edu.
authors.forename: William J
authors.initials: WJ
authors.lastname: Powers
mesh_terms: D002561:Cerebrovascular Disorders / Q000628:therapy*; D019317:Evidence-Based Medicine; D006801:Humans; D016896:Treatment Outcome