Published on in Vol 21, No 2 (2019): February
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/11129, first published
.
1 Division of Specialized Information Services, National Library of Medicine, National Institutes of Health, Bethesda, MD, United States
2 University of Wisconsin-Madison, Madison, WI, United States
3 Arizona State University, Scottsdale, AZ, United States