Funding for this research was provided by:
Sichuan Province Science and Technology Support Program (2020YFS0015)
Received: 2 May 2020
Accepted: 24 September 2020
First Online: 8 October 2020
Ethics approval and consent to participate
: This study was consulted to the ethics committees of Sichuan Center for Disease Control and Prevention. Ethics approval was not available because all data were collected as part of public health emergency surveillance following the Laws of the People’s Republic of China on the Prevention and Treatment of Infectious Diseases. We also did not include any data of patients’ personal information and therefore ethical approval was not required and waived off written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.