Contribution to Authorship
SL, SR and MLW designed and planned the study. SL, SR and MLW performed
the search. SL, SR, YJ, DN, and MLW independently screened and selected
eligible studies, and completed data extraction, verifying each other’s
work. SL, SR, YJ and MLW contributed to the interpretation of the data
and the writing of the article. All authors reviewed and approved the
final version of the manuscript and accepted responsibility for the
paper as published.