Table 3.

Strength of recommendation and quality of evidence.

Category	Definition
Strength of recommendation
A	Strong evidence to support recommendation
B	Moderate evidence to support recommendation
C	Poor evidence to support recommendation
Quality of evidence
I	Evidence of ≥1 randomized controlled clinical trial
II	Evidence of ≥1 well-designed clinical trial, not randomized, cohort or case–control studies (preferably more than one center), or multiple sets of results of uncontrolled studies
III	Evidence based on expert opinion or clinical experience, descriptive studies or committee reports