Those confounded vitamins: what can we learn from the differences between observational versus randomised trial evidence?
Lawlor, Debbie A;
Davey Smith, George;
Kundu, Devi;
Bruckdorfer, K Richard;
Ebrahim, Shah;
(2004)
Those confounded vitamins: what can we learn from the differences between observational versus randomised trial evidence?
Lancet, 363 (9422).
pp. 1724-1727.
ISSN 0140-6736
DOI: https://doi.org/10.1016/S0140-6736(04)16260-0
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