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level of Evidence for scientific studies

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    Levels of evidence
    Level of evidence A Data derived from multiple randomised clinical trials or meta-analyses
    Level of evidence B Data derived from a single randomised clinical trial or large non-randomised studies
    Level of evidence C Consensus of experts opinion and/or small studies, retrospective studies, and registries

    Obviously, Level A evidence is the most ideal and best level of evidence when formulating recommendations for clinical patient care.