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Observational research methods. Research design II: cohort, cross sectional, and case-control studies
Cohort, cross sectional, and case-control studies are collectively referred to as observational studies. Often these studies are the only practicable method of studying various problems, for example, studies of aetiology, instances where a randomised controlled trial might be unethical, or if the co...
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| Formato: | Artigo |
| Lenguaje: | Inglês |
| Publicado: |
BMJ Group
2003
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| Acceso en línea: | https://ncbi.nlm.nih.gov/pmc/articles/PMC1726024/ https://ncbi.nlm.nih.gov/pubmed/12533370 https://ncbi.nlm.nih.govhttp://dx.doi.org/10.1136/emj.20.1.54 |
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