Fig. 1From: Stem cells for the treatment of early to moderate osteoarthritis of the knee: a systematic reviewPRISMA flow diagram for search results. 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(6): e1000097. doi:10.1371/journal.pmed1000097Back to article page