. 2019 Jul 2;21(7):e13490. doi: 10.2196/13490
©Rob A A van Kollenburg, Daniel Martijn de Bruin, Hessel Wijkstra. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 02.07.2019.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), 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.