Author’s contributions
WJX: This author was involved in study design, literature search, results screening, data extraction, statistical analysis and drafting the manuscript.
YCL: This author was involved in study design, results screening, data extraction and article revision.
SYW: This author was involved in study design, literature search and article revision.
HFC: This author was involved in study design, results screening, data extraction and article revision.
JSH: This author was involved in study design, literature search and article revision.
CFF: This author was involved in article revision.
WL: This author was involved in conducting the study and article revision.