Funding for this research was provided by:
Sichuan Province Science and Technology Support Program (2020YFS0564)
Huai’an Municipal Science and Technology Bureau (00092)
Health Department of Sichuan Province (17PJ070)
Chengdu Science and Technology Bureau (2020-YF05-00191-SN)
he Thirteenth Five-Year Project on Tackling Key Problems of National Science and Technology (2017ZX10305501008)
Chengdu Municipal Health Commission (2019079)
Received: 26 October 2020
Accepted: 29 December 2020
First Online: 12 January 2021
Ethics approval and consent to participate
: The Ethics Committee of the Public and Health Clinic Centre of Chengdu approved this study (ethic approval number: PJ-K2020-26-01). Written informed consent was waived by the Ethics Commission of the designated hospital because this study is related to emerging infectious diseases.
: All of participants understand that the information will be published without their child or ward’s/their relative’s (circle as appropriate) name attached, but that full anonymity cannot be guaranteed. All of participants understand that the text and any pictures or videos published in the article will be freely available on the internet and may be seen by the general public. The pictures, videos and text may also appear on other websites or in print, may be translated into other languages or used for commercial purposes. All of participants have been offered the opportunity to read the manuscript.
: The authors declare that they have no competing interests.