Received: 1 April 2021
Accepted: 20 August 2021
First Online: 24 September 2021
: The Research Ethics Committee Board of the International Peace Maternity and Child Health Hospital approved this study. Informed consent obtained was from the parents/ guardians of the study patients, and all methods were performed in accordance with the relevant guidelines and regulations (Declaration of Helsinki).
: Not applicable.
: The authors declare that they have no competing interests.