Published on in Vol 8, No 11 (2020): November
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/21543, first published
.

1 University of Oulu , Oulu , FI
2 University of Siegen , Siegen , DE
3 University of Manchester , Manchester , GB
4 University of Tokyo , Tokyo , JP