Author contributions
Fan Yu, Shaoyou Qin, and Jiangbin Wang designed the study. Fan Yu wrote the manuscript. Fan Yu, Shaoyou Qin, and Song Wang searched the databases, selected the studies, assessed the quality of the included studies, and performed the statistical analysis. Jiangbin Wang and Song Wang approved the last version and should be regarded as co-corresponding authors. Fan Yu and Shaoyou Qin contributed equally to the manuscript and should be regarded as co-first authors.