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. 2020 Jun 5;22(6):e17849. doi: 10.2196/17849

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©Sophie Turnbull, Christie Cabral, Alastair Hay, Patricia J Lucas. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 05.06.2020.

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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Risk of bias assessment for the nonrandomized controlled trial (RCT) studies. ^aOverall risk of bias: equal to the most severe level of bias found in any domain.