Acknowledgements
We would express our heartfelt thanks to all the schoolchildren who
participated in the study and their parents. We also appreciate the
staff of Hunan Children’s Hospital for their support.
Consent for publication
Not applicable
Author Contributions: XSH, JQ and YPC contributed to the
conception and design of the work. JQ, MY and YM provisioned the study
materials or patients. XSH collected and assembled the data. XSH
performed the statistical analyses and interpretated. XSH drafted the
manuscript. XSH and JQ revised the manuscript for important intellectual
content. All authors contributed to the manuscript writing, and all
authors read and approved the final version of manuscript.