Published on in Vol 7 , No 11 (2020) :November
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/15776, first published
.

1 Department of Signal Theory and Communications, and Telematics Engineering, University of Valladolid, Valladolid, ES
2 University Rio Hortega Hospital, Valladolid, ES