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. 2015 Apr 9;17(4):e93. doi: 10.2196/jmir.3991

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©Sonja Grabner-Kräuter, Martin KJ Waiguny. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 09.04.2015.

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.

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