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Table 1.

Definitions of unpublished, grey and published study data.

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Fig 1.

PRISMA statement flow diagram.

(as published by Moher D et al in BMJ 2009;339:b2535).

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Table 2.

Main characteristics of the included methodological research projects.

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Table 2 Expand

Table 3.

Main characteristics of studies included in analyses.

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Table 4.

Risk of bias and generalizability of included methodological research projects.

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Table 5.

Outcomes of the included methodological research projects.

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Table 5 Expand