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Fig 1.

PRISMA chart.

Adapted from Moher D, Liberati A, Tetzlaff, J, Altman DG, The PRISMA GROUP (2009) Studies included in synthesis (n = 54). 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. doi:10.1371/journal.pmed1000097 For more information, visit www.prisma-statement.org.

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Table 1.

Summary table of included studies.

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Table 1 Expand