Contribution to authorship
Author Contributions: Miss Chu had full access to all the data in the
study and takes responsibility for the integrity of the data and the
accuracy of the data analysis. Dr Liu contributed equally to the work as
co–senior authors.
Concept and design: Chu, Liu and Zhang.
Acquisition, analysis, or interpretation of data: Chu, Liu, Qi, Ma,
Zhang.
Drafting of the manuscript: Chu and Liu.
Critical revision of the manuscript for important intellectual content:
Wen, Li,
Cheng, Liang, Kafle, Wu, Wang and Chu
Statistical analysis: Ye and Chu.
Administrative, technical, or material support: Ye, Wen and Zhang
Supervision: Zhang