Figure 1.

Flowchart summarizing the workflow for the systematic review of the literature to identify studies relevant to this single-question guideline. The methodologists used an existing comparative-effectiveness review as a starting point for the systematic review, which was conducted by using relevant databases. The flowchart that overviews the inclusion and exclusion criteria is presented in the Preferred Reporting Items for Systematic Reviews and Meta-Analyses format. AHRQ = Agency for Healthcare Research and Quality.