Study registration: *
Publication Cohn B, medRxiv, 2021
Dates: 2020-12-31 to 2021-07-31
Funding: Public/non profit (Mercatus Center at George Mason University and University of California Office of the President.)
Conflict of interest: Yes (CCM reports consulting for Freenome. AWW reports consulting for ECOM Medical, Obelab, Sensifree, and Shifamed. BAC, PMC, and NYK declare that they have no competing interests.)