Meta-analyses of observational data should be done with due care

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Bibliographic Details
Main Authors:	Smith, George Davey, Egger, Matthias
Format:	Artigo
Language:	Inglês
Published:	British Medical Journal 1999
Subjects:	Letters
Online Access:	https://ncbi.nlm.nih.gov/pmc/articles/PMC1114548/ https://ncbi.nlm.nih.gov/pubmed/9872898
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