Funding for this research was provided by:
National Natural Science Foundation of China (81872694, 81673267 and 81473040)
Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01S155)
Health Industry Scientific Research Project of Gansu Province (GSWSKY2018-18)
Received: 14 March 2020
Accepted: 26 July 2020
First Online: 5 August 2020
Ethics approval and consent to participate
: This study was approved by the Ethical Committee of Guangzhou Center for Disease Control and Prevention (No. GZCDC20200311). Because of the urgent need to collect data on this emerging infectious disease, the requirement for written informed consent was waived. The oral informed consent was obtained from each participant and this form of consent was confirmed by the Ethical Committee.
: Not applicable.
: The authors declare no competing interests.