Published on in Vol 20, No 4 (2018): April
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/10143, first published
.
1 Fred Hutchinson Cancer Research Center, Seattle, WA, United States
2 Department of Psychology, University of Washington, Seattle, WA, United States
3 Kaiser Permanente Washington Health Research Institute, Seattle, WA, United States