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.