MH, YO, and MS carried out literature search, applied the inclusion criteria independently to the articles retrieved and evaluation of quality, data extraction from the articles, and meta-analysis. JM helped to draft the manuscript. MM contributed the design of the study, review of studies, analysis and interpretation of the data. MM drafted the manuscript, made the suggestion for revision. All authors read and approved the final manuscript.
Correction for Authors’ contributions
29 June 2015
Please change Authors’ contributions as follows.
Authors’ contributions
MH, YO, and MS carried out literature search, applied the inclusion criteria independently to the articles retrieved and evaluation of quality, data extraction from the articles, and meta-analysis. JM helped to draft the manuscript. MM contributed the design of the study, review of studies, analysis and interpretation of the data. MM drafted the manuscript, made the suggestion for revision. All authors read and approved the final manuscript.
Competing interests
None declared