Funding for this research was provided by:
Natural Science Foundation of Fujian Province (2017J01238)
Received: 24 August 2020
Accepted: 1 January 2021
First Online: 12 January 2021
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committee of the Fujian Provincial Maternity and Children’s Hospital (Fuzhou, China; approval no. 2014‑042). Written informed consent was obtained from all participants or their guardians.
: Not Applicable.
: The authors declare that they have no competing interests.