Authors’ contributions

Yang Li and Ran Dong were responsible for the design, supervision of the study, and revision of the manuscript. Xuejian Hou drafted the manuscript. Shijun Xu and Zhuhui Huang designed a statistical plan. Yang Li and Taoshuai Liu participated in the revision of the manuscript and the coordination of the study. Xuejian Hou and Zhuhui Huang participated in data acquisition. All authors read and agreed to the final manuscript.