By vgreene, 9 January, 2015 C:Consensus—No supporting studies; based on expert opinion consensus, developed to avoid catastrophic consequences
By vgreene, 9 January, 2015 L:Limited—Supported by 1 moderate or multiple limited studies; recommendation may change in future revisions
By vgreene, 9 January, 2015 M:Moderate—Supported by 1 strong or multiple moderate studies; recommendation less likely to change in future revisions
By vgreene, 9 January, 2015 S:Strong—Supported by multiple strong studies; recommendation unlikely to change in future revisions