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Class of Recommendation for medical procedures or intervention

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    Class of recommendation Definition
    Class I Evidence and/or general agreement that a given treatment or procedure is beneficial, useful, and effective
    Class II Conflicting evidence and/or a divergence of opinion about the usefulness/efficacy of the given treatment or procedure
    Class IIa Weight of evidence/opinion is in favour of usefulness/efficacy
    Class IIb Usefulness/efficacy is less well established by evidence/opinion
    Class III Evidence or general agreement that the given treatment or procedure is not useful/effective, and in some cases may be harmful

    Each procedural recommendation is categorised as either Class I, IIa/IIb, and III, respectively.  The lower the class number, the greater the evidence and/or general agreement in favour of an intervention.