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Pragmatic controlled clinical trials in primary care: the struggle between external and internal validity
BACKGROUND: Controlled clinical trials of health care interventions are either explanatory or pragmatic. Explanatory trials test whether an intervention is efficacious; that is, whether it can have a beneficial effect in an ideal situation. Pragmatic trials measure effectiveness; they measure the de...
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| Egile Nagusiak: | , , , , , , , |
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| Formatua: | Artigo |
| Hizkuntza: | Inglês |
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BioMed Central
2003
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| Sarrera elektronikoa: | https://ncbi.nlm.nih.gov/pmc/articles/PMC317298/ https://ncbi.nlm.nih.gov/pubmed/14690550 https://ncbi.nlm.nih.govhttp://dx.doi.org/10.1186/1471-2288-3-28 |
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