Contribution to authorship
Xiajing Chu, Meixuan Li designed and performed the search, selected studies for inclusion, collected data, planned and performed the statistical analyses, Xiajing Chu, Meixuan Li contributed to the interpretation of the results, and drafted the initial and final version of the manuscript. Xiajing Chu, Meixuan Li, and Peijing Yan contributed to the interpretation of the results, and reviewed and revised the manuscript. Xiajing Chu, Meixuan Li, Jingwen Li and Lufang Feng conceptualized and designed the study, contributed to the search, selected studies for inclusion, supervised data collection. Xinrong Liu and Kehu Yang contributed to the statistical analyses and interpretation of the results, and reviewed and revised the manuscript.