Observational versus randomised trial evidence

Lawlor, DA; Davey Smith, G; Bruckdorfer, KR; Kundu, D; Ebrahim, S; (2004) Observational versus randomised trial evidence. Lancet, 364 (9436). p. 755. ISSN 0140-6736 DOI: https://doi.org/10.1016/S0140-6736(04)16926-2

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