Published on in Vol 6, No 2 (2018): February
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9265, first published
.
1 Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, MD, United States
2 Department of Emergency Medicine, Wellspan York Hospital, York, PA, United States
3 National Institute on Aging, Baltimore, MD, United States