Funding for this research was provided by:
Capital Foundation of Medical Development (2016-2-40114)
The National Key Research and Development Program of China (2016YFC0901500)
CAMS Innovation Fund for Medical Sciences (2016-I2M-1-008)
Public Welfare Scientific Research Project of China (201402012)
Received: 20 August 2020
Accepted: 10 March 2021
First Online: 23 March 2021
: Written informed consent was obtained from the parents following a full explanation of the nature of the study. The ethics committees of Peking Union Medical College Hospital approved the study(ZJS-1248, JS-1660).
: Written consent obtained.
: The authors declare that they have no conflicts of interest.