Primary versus secondary source of data in observational studies and heterogeneity in meta-analyses of drug effects: a survey of major medical journals

BACKGROUND: The data from individual observational studies included in meta-analyses of drug effects are collected either from ad hoc methods (i.e. “primary data”) or databases that were established for non-research purposes (i.e. “secondary data”). The use of secondary sources may be prone to measu...

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Detaylı Bibliyografya
Yayımlandı:BMC Med Res Methodol
Asıl Yazarlar: Prada-Ramallal, Guillermo, Roque, Fatima, Herdeiro, Maria Teresa, Takkouche, Bahi, Figueiras, Adolfo
Materyal Türü: Artigo
Dil:Inglês
Baskı/Yayın Bilgisi: BioMed Central 2018
Konular:
Research Article
Online Erişim:https://ncbi.nlm.nih.gov/pmc/articles/PMC6161342/
https://ncbi.nlm.nih.gov/pubmed/30261846
https://ncbi.nlm.nih.govhttp://dx.doi.org/10.1186/s12874-018-0561-3
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