Case series
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A case series (also known as a clinical series) is a medical research study that tracks patients with a known exposure given similar treatment[1] or examines their medical records for exposure and outcome.
A case series can be retrospective or prospective and usually involves a smaller number of patients than more powerful case-control studies or randomized controlled trials.
A case series is a type of observational study. Case series may be consecutive[2] or non-consecutive,[3] depending on whether all cases presenting to the reporting authors over a period of time were included, or only a selection.
Case series may be confounded by selection bias, which limits statements on the causality of correlations observed.