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Controlled clinical trials, ISSN 0197-2456, 1980
Journal
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 | Public Health | Study design | Screening | Selection of subjects | Cause and effect | Bias | Intervention trials | Confounding | Case-control study | Statistical methods | Observational studies
Book
2005, Statistics in practice, ISBN 9780470863626, 220
Selection bias can, and does, occur, even in randomized clinical trials. Steps need to be taken in order to ensure that this does not compromise the integrity of clinical trials... 
Clinical trials | Sampling (Statistics) | Ranking and selection (Statistics) | Evaluation | Statistical methods
eBook
Epilepsia (Copenhagen), ISSN 0013-9580, 2013, Volume 54, Issue 3, pp. 551 - 563
Journal Article
The international journal of neuropsychopharmacology, ISSN 1469-5111, 2016, Volume 20, Issue 2, pp. pyw100 - 179
Journal Article