Contribution to authorship
All authors contributed to the study protocol. The literature search was
performed by A.H, N.T and B.H.R. Literature screening, data extraction,
were performed by D.P, A.H, N.T and B.H.R. Risk of bias evaluation was
performed by A.H and N.T.
A.H and B.H.R conducted the analyses. The draft of the manuscript was
written by A.H, B.H.R and R.R., and all authors commented on earlier
versions of the manuscript. All
authors read and approved the final manuscript
Disclosure statement: The authors report no conflict of
interest.Source of funding: None
Acknowledgments: Not applicable