Text and Data Mining valid from 2020-03-18
Received: 22 December 2019
Accepted: 12 March 2020
First Online: 18 March 2020
Ethics approval and consent to participate
: The experimental protocols were established following the Declaration of Helsinki and approved by the Human Ethics Committee of Jilin University (Changchun, China). Written informed consent was obtained from all children’s parents.
: Written informed consent for publication of their clinical details was obtained from their parents.
: The authors declare that they have no competing interests.