Details of ethics approval
Since this study was a systematic review and meta-analysis, ethics approval was not required.
Funding: NHMRC Peter Doherty Early Career Fellowship awarded to PHA (GNT (GNT1090778), NHMRC Public Health Early Career Fellowship awarded to ZSL (GNT1141382). CTR is supported by a NHMRC Investigator Grant (GNT1174971) and a Matthew Flinders Fellowship from Flinders University.