Lancet. 2004 May 22;363(9422):1728-31.

When are observational studies as credible as randomised trials?

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Department of Clinical Epidemioloy, Leiden University Medical Centre, Bldg 1 C9-P, 2300 RC Leiden, Netherlands. J.P.Vandenbroucke@lumc.nl

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Beyond randomised versus observational studies. [Lancet. 2004]
Beyond randomised versus observational studies.Concato J, Horwitz RI. Lancet. 2004 May 22; 363(9422):1660-1.
Observational versus randomised trial evidence. [Lancet. 2004]
Observational versus randomised trial evidence.Wiseman M. Lancet. 2004 Aug 28-Sep 3; 364(9436):755-6; author reply 756-7.

PMID:: 15158638; [PubMed - indexed for MEDLINE]

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