Observational versus randomised trial evidence.
Lawlor
Debbie A
DA
Davey Smith
George
G
Bruckdorfer
K Richard
KR
Kundu
Devi
D
Ebrahim
Shah
S
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
D000975:Antioxidants; D001205:Ascorbic Acid