Published on in Vol 20, No 5 (2018): May
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9610, first published
.
1 The University of Texas at Austin, Austin, TX, United States
2 Emory University, Atlanda, GA, United States
3 Northeastern University, Boston, MA, United States