Conception and design: Zheng, Z Li. Acquisition of data: Zheng, Liu, Z Li, S Li, Zhang. Analysis and interpretation of data: all authors. Drafting the article: all authors. Critically revising the article: Zheng, Yang, Wang, X Li. Reviewed submitted version of manuscript: Zheng, S Li, Wang. Approved the final version of the manuscript on behalf of all authors: Zheng. Statistical analysis: Zheng, Yang. Administrative/technical/material support: Zheng. Study supervision: Zheng.
Dr. Zhang: The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, China.