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AHA Classes and Levels of Evidence. Class IAgreement the treatment is useful and effectiveClass IIConflicting evidence and/or a divergence of opinion about the usefulness/efficacy of a treatment.Class IIaWeight of evidence is in favor of the treatment.Class IIbUsefulness/efficacy is less well established by evidenceClass IIIEvidence and/or general agreement that the treatment is not useful/effective and in some cases may be harmful.Levels of EvidenceA:Data derived from multiple r9455
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