Published on in Vol 22 , No 10 (2020) :October
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/19804, first published
.

1 Faculty of Humanities and Arts, Macau University of Science and Technology, Taipa, MO
2 Center for Tobacco Control Research and Education, University of California, San Francisco, San Francisco, CA, US
*all authors contributed equally