Received: 12 November 2020
Accepted: 15 March 2021
First Online: 23 March 2021
: This study was exempted from IRB review at CDC due to being public-health non-research surveillance data and thus no consent is needed. All data were completely deidentified. All the methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.