Class of Recommendation: reflecting the extent of the treatment effect

Class I	Benefit >>> Risk; Evidence and/or general agreement that a iven treatment or procedure is beneficial, usefull and efective
Class IIa	Benefit >> Risk; Conflicting evidence and/or a diversion of opinion about the benefit of the procedure, but the evidence supports that the treatment/procedure can help the patient;
Class IIb	Benefit ≥ Risk; Conflicting evidence and/or a diversion of opinion about the benefit of the procedure and, it is not well defined whether the treatment/procedure can help the patient;
Class III	Risk ≥ Benefit; Evidence or general agreement that the given treatment or procedure is not useful/effective, and in some cases may be harmful.