Published on in Vol 21, No 7 (2019): July
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/12980, first published
.
1 Divison of Emerging Media, Boston University College of Communication, Boston, MA, United States
2 Department of Community Health Sciences, Boston University School of Public Health, Boston, MA, United States