Published on in Vol 2, No 3 (2021): Jul-Sep
Preprints (earlier versions) of this paper are
available at
https://www.medrxiv.org/content/10.1101/2021.01.05.21249239v1, first published
.
1 US Food and Drug Administration, Silver Spring, MD, United States
2 Booz Allen Hamilton, McLean, VA, United States
3 US Food and Drug Administration, Rockville, MD, United States