Those confounded vitamins: what can we learn from the differences between observational versus randomised trial evidence?

Lawlor, DA; Davey Smith, G; Kundu, D; Bruckdorfer, KR; Ebrahim, S; (2004) Those confounded vitamins: what can we learn from the differences between observational versus randomised trial evidence? Lancet, 363 (9422). pp. 1724-7. ISSN 0140-6736 DOI: https://doi.org/10.1016/S0140-6736(04)16260-0

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