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A cross sectional study looks at a patient cohort across a span of time?
All longitudinal studies are useful to assess direct causation relating to the outcome being investigated?
Retrospective studies are at high risk of recall bias?
All cohort studies are prospective?
Qualitative data describes the results in terms of written numbers rather than figures, e.g. one rather than 1?
Quantitative data can be measured and written down in numbers?