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selection bias
[An error in choosing the individuals or groups to take part in a study. Ideally, the subjects in a study should be very similar to one another and to the larger population from which they are drawn (for example, all individuals with the same disease or condition). If there are important differences, the results of the study may not be valid. ( NCI )]
UMLS (NCI) C0036577- Quantitative Concept
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