Published on in Vol 8 , No 4 (2020) :April
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/15960, first published
.

1 Oklahoma Tobacco Research Center, Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
2 Moffitt Cancer Center, Tampa, FL, United States