Published on in Vol 4, No 5 (2020): May
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/16297, first published
.
1 Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, United States
2 Department of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia, SC, United States