Author Contributions
Qing Wu and Tan Lin not only conceived and designed the study but also participated in the drafting and writing of the manuscript. They also supervised the study and critically revised the manuscript. Qing Wu, Qingmei Yang, Lin Wu and Yanling Lin collected the clinical data. Qing Wu, Qingmei Yang and Tan Lin were responsible for drafting and writing the manuscript and conducting statistical analyses. All the authors substantially contributed to the revision of the manuscript.