Funding for this research was provided by:
The Special Fund of the Pediatric Medical Coordinated Development Center of Beijing Hospitals Authority (XTZD20180303)
Article History
Received: 24 February 2020
Accepted: 20 July 2020
First Online: 25 August 2020
Compliance with ethical standard
:
: None of the contributing authors have any conflict of interest, including specific financial interests or relationships and affiliations relevant to the subject matter or materials discussed in the manuscript.