Fig. 1From: The effect of orthodontic treatment on smile attractiveness: a systematic reviewFlow diagram for the selection of studies according to PRISMA. (Diagram 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.pmed1000097)Back to article page