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

1. Prada-Ramallal, G.
2. Roque, F.
3. Herdeiro, M.T.
4. Takkouche, B.
5. Figueiras, A.

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DOI: 10.1186/S12874-018-0561-3 GOOGLE SCHOLAR lock_openOpen access editor

Data source: Scopus