Risk of bias in included studies . The Characteristics of included
studies tables give full details of the risk of bias among the included
studies. A bias assessment across domains for each key outcome for each
included study is represented in Figure
2 (Risk of bias summary review of authors’ judgments about each risk of
bias item for each included study) andFigure
3(Risk of bias graph review authors’ judgments about each risk of bias
item presented as percentages across all)