Preferred Reporting Items for Systematic Reviews and Meta-Analyses flow diagram of study selection process.

Note. Figure format from “Preferred Reporting Items for Systematic Reviews and Meta-Analyses: The PRISMA Statement,” by D. Moher, A. Liberati, J. Tetzlaff, and D. G. Altman; PRISMA Group, 2009, PLoS Medicine, 6(6), e1000097. https://doi.org/10.1371/journal.pmed.1000097