Contributorship statement
We thank for support by the sources of funding in this study. Study
design and concept of this meta-analysis were carried out by Xiu Hua
Wan, Jingshang Zhang, Jinda Wang and Shanshan Jin; Shanshan Jin and
Jingshang Zhang conducted the data collection; Shanshan Jin and Kai Cao
performed the data analysis; Ying Xiong, Guyu Zhu, Jing Li and Hailong
He provided interpretation of the data. Shanshan Jin performed the first
draft of the manuscript; Shanshan Jin, Jingshang Zhang, Jinda Wang and
Xiu Hua Wan revised the manuscript and produced the final version;
English polishing was done by Mayinuer Yusufu.