Transcription of PRISMA 2009 flow diagram
1 PRISMA 2009 Flow diagram Identification Records identified through Additional records identified database searching through other sources (n = ) (n = ) Records after duplicates removed (n = ) Screening Records screened Records excluded (n = ) (n = ) Full-text articles assessed Full-text articles excluded, for eligibility with reasons Eligibility (n = ) (n = ) Studies included in qualitative synthesis (n = ) Included Studies included in quantitative synthesis (meta-analysis) (n = ) 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.
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