Footnotes

• CAB and SAH contributed equally.

• Contributors CAB and SAH contributed equally to protocol writing, trial selection, data extraction, data analysis, data interpretation, review writing and future review updates. DLB, DPF, EMO, TK, TE, DEH and JMB contributed to data analysis, data interpretation and review writing. CG contributed to data analysis, data interpretation, review writing, as well as with TSA and GRADE expertise. CAB had full access to all of the data and takes responsibility for the integrity of the data and the accuracy of the data analysis. CAB and SAH are guarantors.

• Competing interests None declared.

• Provenance and peer review Commissioned; externally peer reviewed.

• Data sharing statement No additional data are available.