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

Crossref DOI link: https://doi.org/10.1186/s12874-018-0561-3

Published Online: 2018-09-27

Published Print: 2018-12

Update policy: https://doi.org/10.1007/springer_crossmark_policy

Authors

Prada-Ramallal, Guillermo

Roque, Fatima

Herdeiro, Maria Teresa

Takkouche, Bahi

Figueiras, Adolfo http://orcid.org/0000-0002-5766-8672
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Text and Data Mining valid from 2018-09-27
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Article History

Received: 1 March 2018

Accepted: 18 September 2018

First Online: 27 September 2018

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