Published on in Vol 8, No 4 (2019): April
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/12304, first published
.
1 Digital Health and Clinical Informatics, RTI International , Research Triangle Park, NC, US
2 Air Quality and Exposure, RTI International , Research Triangle Park, NC, US
3 Center for Health Policy Science and Tobacco Research, RTI International , Research Triangle Park, NC, US