Figure 1.

PRISMA flow diagram of bibliographic and gray literature searches (SLR overall).

PRISMA flow diagram of the entire SLR from which the results for RCT are reported. Presentation adapted from Moher D, Liberati A, Tetzlaff J, Altman DG, The PRISMA Group (2009) Preferred Reporting Items for Systematic Reviews and Meta-Analyses: The PRISMA Statement. PLoS Med 6(7): e1000097. https://doi.org/10.1371/journal.pmed.1000097. ACIP – Advisory Committee on Immunization Practices, CDC – Centers for Disease Control and Prevention, RCT – Randomized Controlled Trials, SLR – Systematic Literature Review, WHO – World Health Organization