title: Observational versus randomised trial evidence.
authors.forename: Debbie A
authors.initials: DA
authors.lastname: Lawlor
authors.forename: George
authors.initials: G
authors.lastname: Davey Smith
authors.forename: K Richard
authors.initials: KR
authors.lastname: Bruckdorfer
authors.forename: Devi
authors.initials: D
authors.lastname: Kundu
authors.forename: Shah
authors.initials: S
authors.lastname: Ebrahim
mesh_terms: D000975:Antioxidants / Q000008:administration & dosage*; D001205:Ascorbic Acid / Q000008:administration & dosage*; D002318:Cardiovascular Diseases / Q000517:prevention & control*; D015986:Confounding Factors, Epidemiologic; D006801:Humans; D019370:Observation; D016032:Randomized Controlled Trials as Topic; D012107:Research Design
chemical_list: D000975:Antioxidants; D001205:Ascorbic Acid