Zhang, Xinqi
Zhang, Yinfeng
Article History
Received: 24 October 2019
Accepted: 26 June 2020
First Online: 14 July 2020
Ethics approval and consent to participate
: This research was approved by the Ethics Committee of Second Hospital of Hebei Medical University. All methods were carried out in accordance with relevant guidelines and regulations. Written Informed consent was obtained from all the study subjects’s parents bfore enrollment.
: Not applicable.
: The authors declare that they have no competing interests.