Published on in Vol 6, No 2 (2020): Apr-Jun
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/19369, first published
.

1 Department of Health Sciences, University of York , York , GB
2 Division of Infectious Diseases and Global Health, Department of Medicine, University of California San Diego, San Diego, CA, US
3 Department of Computer Science, Johns Hopkins University , Baltimore, MD, US
4 Everytown for Gun Safety , New York, NY, US