We will consider systematic reviews or meta-analyses of randomized controlled trials (RCTs), pseudo-RCTs, and cohort and case-control studies. Network meta-analyses, if available, will also be reviewed. In order to ensure literature saturation, we aim to consider any recently published RCTs found to not have been included in the meta-analyses. Should recent RCTs be identified, these will also be appraised and their findings will be presented and discussed. No language limitation will be imposed. Only human studies with full text available will be analyzed.