Reference | Year | A priori design? |
Two data extractor and consensus? | Comprehensive literature search? | Statement on inclusion of grey literature? Language? | List of included and excluded studies? | Characteristics of studies provided, for example, tables? | Quality of risk of bias assessment? | Scientific quality of the included studies used appropriately in formulating conclusions? | Methods used to combine the findings of studies appropriate? Test on heterogeneity | Likelihood of publication bias assessed? | Conflict of interests stated? | Sum |