Funding for this research was provided by:
Health and Family Planning Commission of Shenzhen Municipality (201602009)
China Mega-Project for Infectious Disease (2017ZX10302301-004 and 2017ZX10104001)
Medical Scientific Research Foundation of Guangdong Province (A2017143)
Shenzhen Science and Technology Innovation Committee (JCYJ20160428152017475)
Text and Data Mining valid from 2019-06-26
Received: 14 February 2019
Accepted: 4 June 2019
First Online: 26 June 2019
Ethics approval and consent to participate
: All aspects of the study were performed in accordance with national ethics regulations and approved by the Ethics Committee of Shenzhen Children’s Hospital and Futian District Center for Disease Control and Prevention. Written consent was obtained from children’s parents or guardians.
: Not applicable.
: The authors declare that they have no competing interests.