Published on in Vol 8, No 4 (2020): April
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/16507, first published
.
1 Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology, Trondheim, Norway
2 Department of Electrical, Electronic and Information Engineering "Guglielmo Marconi" (DEI), University of Bologna, Bologna, Italy