Contribution to authorship
All authors contributed to creation of draft for this research article,
reviewed the final draft and provided comments. AG designed the study,
selected and reviewed studies identified by the scientific literature
search, did the Cochrane risk of bias, wrote drafts with EK and wrote
the final paper. AG contributed to the statistical analysis, data
synthesis of outcomes and grading of the evidence with EK. JV was
involved in the conception and design of the study, reviewed abstracts
to identify the core studies, extracted the data from included studies,
critically reviewed and edited the final paper. AG was involved in the
development of search strategy and contributed to the methods writing
section. JV did the planning analysis, reviewed articles selected by AG
and EK, and helped with data extraction from selected articles.