Contribution to Authorship
FMcC, AK, GMurphy conceived the study and FMcC, AK, GMurphy, SA, LOB, GMaher designed the protocol. LOB, SA performed the literature search. LOB, SA, AOS selected the studies and extracted the relevant information. LOB, GMaher synthesised the data. LOB wrote the first draft of the paper. FMcC, AKĀ , GMurphy, GMaher critically revised successive drafts of the paper. LOB is the guarantor of the review.