Published on in Vol 22, No 6 (2020): June
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/15160, first published
.
1 Institute for Global Tobacco Control, Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
2 Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States