Published on in Vol 22, No 11 (2020): November
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/21646, first published
.
1 Simon Fraser University, Burnaby, BC, Canada
2 John Hopkins University, Baltimore, MD, United States
3 Hong Kong University, Hong Kong, China (Hong Kong)
4 London School of Economics, London, United Kingdom