Funding for this research was provided by:
Natural Science Foundation of Anhui Province (1808085QH248)
Received: 20 April 2020
Accepted: 15 July 2020
First Online: 31 July 2020
Ethics approval and consent to participate
: We conducted this study in accordance with the Declaration of Helsinki, and all participants and their parents were aware of the study protocol and signed the written consent forms. The ethical approval for the study was obtained from Anhui provincial hospital ethics committee (Certificate No. 2019-KY-09).
: Not Applicable.
: The authors declare that they have no competing interests.