Published on in Vol 1, No 2 (2018): Jul-Dec
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/11569, first published
.
1 Department of Kinesiology and Community Health, University of Illinois at Urbana Champaign, Urbana, IL, United States
2 Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States
*these authors contributed equally