Published on in Vol 5, No 8 (2021): August
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/30164, first published
.

1 Division of General Internal Medicine and Health Services Research, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, US
2 Gallup , Washington, DC, US
3 Department of Biostatistics, Fielding School of Public Health, University of California, Los Angeles, Los Angeles, CA, US