Contribution to authorship:
Dr. Zhou and Dr. Li had full access to all of the study data and take responsibility for the integrity of the data and the accuracy of the data analysis.
Concept and design: Zhou and Li.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Zhou and Li.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Zhou and Li.
Obtained funding: Li.
Administrative, technical, or material support: Li.