Funding for this research was provided by:
Fund for Graduates’ Innovative Projects of Hebei Provincial Department of Education (CXZZBS2020121)
Received: 20 July 2020
Accepted: 26 November 2020
First Online: 10 December 2020
Ethics approval and consent to participate
: Institutional review board approval of the Ethics Committee of the third hospital of Hebei Medical University (No. G2016–020-1) was obtained. All the patients were under 16 when the follow-up started. So, written consents to participate were obtained from the parents of the minor patients included in this study.
: All involved patients gave their written informed consent to publication.
: The authors declare that they have no competing interests.