Figure 2.

Preferred Reporting Items for Systematic Reviews and Meta-Analyses. (PRISMA) flow diagram. PRISMA diagram of included studies and reasons for exclusion. Note that the number of total studies is lower than the sum of each category, as some studies reported on more than 1 outcome. There were no studies reporting directly on cost or vaccine effectiveness in the context of endoscopy. We therefore used existing reviews from the CDC in nonendoscopy settings with an updated search to indirectly inform our guidance as outlined in this document.