Funding for this research was provided by:
National Natural Science Foundation of China (Grant No. 81772154)
Beijing Municipal and Commission Health and Family Planning (2015-3-076)
the Major Infectious Diseases Such as AIDS and Viral Hepatitis Prevention and Control Technology Major Projects (Grant No. 2018ZX10712-001)
Text and Data Mining valid from 2019-12-01
Received: 26 May 2019
Accepted: 29 November 2019
First Online: 10 December 2019
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Ethics Committee of Beijing Children’s Hospital (No. 2017–23) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Participant consent was written by the guardian of all the patients and informed consent forms were archived.
: Not applicable.
: The authors declare that they have no competing interests.