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2007, 3rd ed., Oxford medical publications, ISBN 9780198529552, xiii, 570
.... This system emphasizes the central importance of cause and effect relationships. Its great strength is that it is applicable to a wide range of issues, and both to intervention trials and observational studies... 
Geneeskunde | Evaluation | Epidemiologic Studies | Wetenschappelijke publicaties | Methodology | Epidemiologic Methods | Kritisch denken | Clinical trials | Research | Epidemiology | Medicine: General Issues | Study design | Screening | Selection of subjects | Cause and effect | Bias | Intervention trials | Confounding | Case-control study | Statistical methods | Observational studies
Book
Controlled clinical trials, ISSN 0197-2456, 1980
Journal
Contemporary clinical trials, ISSN 1551-7144, 2005
Journal
The New England journal of medicine, ISSN 1533-4406, 2016, Volume 375, Issue 5, pp. 454 - 463
Journal Article