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Except where otherwise noted, this item's license is described as © Jesús Montero-Marín, Ricardo Araya, María C Pérez-Yus, Fermín Mayoral, Margalida Gili, Cristina Botella, Rosa Baños, Adoración Castro, Pablo Romero-Sanchiz, Yolanda López-Del-Hoyo, Raquel Nogueira-Arjona, Margarita Vives, Antoni Riera, Javier García-Campayo. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 26.08.2016. This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.