title: What is medical evidence?
authors.affiliation: Department of Surgery (Neurosurgery), Harvard Medical School, Boston, Massachusetts, USA.
authors.forename: Fred G
authors.initials: FG
authors.lastname: Barker
mesh_terms: D016022:Case-Control Studies; D002986:Clinical Trials as Topic; D015331:Cohort Studies; D019317:Evidence-Based Medicine / Q000458:organization & administration*; D006801:Humans; D009493:Neurosurgery; D012196:Review Literature as Topic