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Article History

Received: 21 January 2021

Accepted: 11 June 2021

First Online: 17 July 2021

Declarations

:

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and the data used in our research acquired administrative permissions, consent waiver obtained from the institutional ethics committee of Fujian Maternity and Children’s Hospital. The study was legally approved by the institutional ethics committee of Fujian Maternity and Child Health  Hospital and conducted in accord with the guidelines of the Declaration of Helsinki, and the rights of all participants were protected.

: All data was anonymous. Therefore individual consent for publication was not required.

: The authors declare that they have no competing interests.