Published on in Vol 6, No 2 (2020): Apr-Jun
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/10919, first published
.
1 Instituto de Salud Carlos III, ISCIII, Information and Communication Technologies Unit, Madrid, Spain
2 The National Distance Education University (UNED), Madrid, Spain
3 Instituto de Salud Carlos III, ISCIII, Telemedicine and Health Research Unit, Madrid, Spain