Funding for this research was provided by:
Cooperation Project of Hunan Science Foundation and Zhuzhou (2017JJ4060)
Text and Data Mining valid from 2019-11-29
Received: 20 August 2019
Accepted: 19 November 2019
First Online: 29 November 2019
Ethics approval and consent to participate
: Written informed consent was obtained from the parents, and this study was approved by the institutional review board at the Second Xiangya Hospital of Central South University.
: Written informed consent was obtained from the parents. The parents gave consent for their personal or clinical details along with any identifying images to be published in this study.
: The authors declare that they have no competing interests.