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Comment
. 2009 Mar 15;169(6):783; author reply 783-4.
doi: 10.1093/aje/kwp016. Epub 2009 Feb 10.

Re: Should meta-analyses of interventions include observational studies in addition to randomized controlled trials? A critical examination of underlying principles

Carlos Pereira, Euclides Castilho
Comment

Re: Should meta-analyses of interventions include observational studies in addition to randomized controlled trials? A critical examination of underlying principles

Carlos Pereira et al. Am J Epidemiol. .
No abstract available

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