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ijs914-sup-0001-si.JPG328K

Fig. S1 Risk of bias graph: review author's judgements about each risk of bias item presented as percentages across all included studies.

ijs914-sup-0002-si.JPG921K

Fig. S2 Risk of bias summary: review author's judgements about each risk of bias item for each included study.

ijs914-sup-0003-si.doc112K

Appendix S1. Search strategies used in electronic databases and trial registries.

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