Authors’ contributions
Conception and design: Q Li and B Xu. Development of methodology: Q Li, J Wang, and B Xu. Acquisition of data (acquired and managed patients, provided facilities, etc.): J Wang, L Gui, J Wang, Y Chi, Q Li, Y Mu, and B Xu. Analysis and interpretation of data (e.g., statistical analysis, computational analysis): Q Li and J Wang. Writing, review, and/or revision of the manuscript: J Wang, Q Li, and B Xu. Administrative, technical, or material support (i.e., reporting or organizing data, constructing databases): J Wang, Z Liu, L Gui, Q Li, and Y Mu. Study supervision: Q Li and B Xu.