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