To collect the evidence, the guideline developers performed searches of electronic databases; ACCP also conducted hand-searches of published literature (primary and secondary sources). The guideline developers provide relevant details of their search strategies including databases searched, date ranges applied, and key words used. Methods used to assess the quality and strength of the evidence were similar, with both developers weighting it according to a rating scheme. To analyze the selected evidence, both groups performed a systematic review with evidence tables. In addition, ACCP performed a meta-analysis; both groups reviewed published meta-analyses. The developers provide a description of the evidence analysis process.