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. 2018 Nov 6;20(11):e270. doi: 10.2196/jmir.9366

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©Amaryllis Mavragani, Gabriela Ochoa, Konstantinos P Tsagarakis. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 06.11.2018.

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.

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Preferred Reporting Items for Systematic Reviews and Meta-Analyses flow diagram of the selection procedure for including studies.