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. 2020 Oct 29;22(10):e21159. doi: 10.2196/21159

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©Vera Helen Buss, Stuart Leesong, Margo Barr, Marlien Varnfield, Mark Harris. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 29.10.2020.

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 summary table for the nonrandomized controlled trials. The upper 2 are cardiovascular disease studies and the lower 1 is a type 2 diabetes study.