Editorial

• Literatur

• 1 Becker LA, Oxman AD. Chapter 22: Overviews of Reviews. In: Higgins JPT, Green S, (eds) Cochrane Handbook for Systematic Reviews of Interventions. Chichester: Wiley; 2008
• 2 Higgins JG, Green S (eds). Cochrane Handbook for Systematic Reviews of Interventions. Chichester: Wiley; 2008
• 3 Liberati A, Altman DG, Tetzlaff J et al. The PRISMA statement for reporting systematic reviews and meta-analyses of studies that evaluate health care interventions: explanation and elaboration. PLoS Med 2009; 6: e1000100
• 4 Shea BJ, Grimshaw JM, Wells GA et al. Development of AMSTAR: a measurement tool to assess the methodological quality of systematic reviews. BMC Med Res Methodol 2007; 7: 10