Published on in Vol 5, No 12 (2017): December
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/8458, first published
.
1 Facultad de Enfermería, Fisioterapia y Podología, Universidad de Complutense de Madrid, Madrid, Spain
2 Universidad Rey Juan Carlos, Alcorcon, Spain
*all authors contributed equally