Observational versus randomised trial evidence.

Debbie A Lawlor ; George Davey Smith ; K Richard Bruckdorfer ; Devi Kundu ; Shah Ebrahim ; (2004) Observational versus randomised trial evidence. Lancet, 364 (9436). 755-. ISSN 0140-6736 DOI: 10.1016/S0140-6736(04)16926-2
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