Study types and levels of scientific evidence
You should start EBD search by looking for the highest available level of evidence to answer a specific clinical question (Forrest 2016). If a clinical practice guideline or meta-analysis is not available on the topic, look next for systematic reviews without statistical synthesis, followed by individual randomized control trials, cohort studies, and so on.
Here are some of the links to learn more about EBD process:
21.3 Sources of Information
Additional resources to use to find and appraise the evidence:
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