Published on in Vol 5 , No 12 (2017) :December
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9035, first published
.

1 Computational Biology Research Group, Department of Computer Science, University of South Carolina, Columbia, SC, US
2 Department of Health Promotion, Education & Behavior, Arnold School of Public Health, University of South Carolina, Columbia, SC, US