Fig. 1From: An evaluation of the Invisalign® Aligner Technique and consideration of the force system: 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): e1000097Back to article page