Funding for this research was provided by:
the 2017 Xiamen Science and Technology Planning Project (3502Z20171006)
Received: 19 December 2020
Accepted: 10 March 2021
First Online: 23 March 2021
: This study was approved by the Women and Children’s Hospital, School of Medicine, Xiamen University. Oral consent was obtained from participants’ parents, and demographics (omitted the participants and their mother’s name) and clinical records were collected according to the verbal consent procedure. The verbal consent procedure was approved by the Institutional Review Board at our hospital.
: Not applicable.
: The authors declare that they have no competing interests.