Funding for this research was provided by:
National Natural Science Foundation of China (81773552)
the National Key Research and Development Program of China (2017YFC1200502, 2018YFC1315302)
the Special Foundation for Basic Scientific Research of Central Universities (2020YJ066)
Received: 17 December 2020
Accepted: 10 May 2021
First Online: 28 May 2021
: Data collection, which was determined by the National Health Commission of the People’s Republic of China, was exempt from institutional review board approval because it was part of an outbreak investigation. Study design and data analysis have been reviewed and approved by the Medical Ethical Committees of Wuhan University (WHU2020-2020YF0031).
: Not applicable.
: The authors declare that they have no competing interests.