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.