Funding for this research was provided by:
Special Fund of the Pediatric Medical Coordinated Development Center of Beijing Hospitals Authority (XTCX201812)
Beijing Municipal Administration of Hospitals Clinical Medicine Development of Special Funding Support (ZYLX201840)
Article History
Received: 5 August 2020
Accepted: 19 November 2020
First Online: 11 December 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.