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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
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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| Publicado no: | BMC Med Res Methodol |
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| Main Authors: | , , , , |
| Formato: | Artigo |
| Idioma: | Inglês |
| Publicado em: |
BioMed Central
2018
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| Assuntos: | |
| Acesso em linha: | 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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