Funding for this research was provided by:
Liaoning Provincial Natural Science Foundation Project (20180550988)
Received: 15 July 2020
Accepted: 2 September 2021
First Online: 13 September 2021
: The study was approved by the ethics committee of the First Affiliated Hospital of Jinzhou Medical University. A written informed consent was taken from their parents before participating in the study. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare no complete of interests.