PRISMA Guidelines:
Preferred Reporting Items for Systematic Reviews and Meta-Analyses: The PRISMA Statement.
Moher D, Liberati A, Tetzlaff J, Altman DG, The PRISMA Group. PLoS Med 2009; 6(7):e1000097.
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The PRISMA Statement for Reporting Systematic Reviews and Meta-Analyses of Studies That Evaluate Health Care Interventions: Explanation and Elaboration.
Liberati A, Altman DG, Tetzlaff J, Mulrow C, Gøtzsche PC, Ioannidis JPA, Clarke M, Devereaux PJ, Kleijnen J, Moher D. PLoS Med 2009; 6(7):e1000100.
Full text available here