Additional File 1.

Table 1 – Initial list of items together with review evidence. Table 1 contains the list of 28 possible items for inclusion in the quality assessment tool which were rated using the Delphi procedure. It also contains the results of the systematic reviews on sources of bias and variation, and existing quality assessment tools.

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Whiting et al. BMC Medical Research Methodology 2003 3:25   doi:10.1186/1471-2288-3-25