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. 2021 Feb 9;23(2):e23467. doi: 10.2196/23467

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©Mahmoud Elkhodr, Omar Mubin, Zainab Iftikhar, Maleeha Masood, Belal Alsinglawi, Suleman Shahid, Fady Alnajjar. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 09.02.2021.

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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The 13 apps corresponding to 10 countries included in this study. DP-3T: Decentralized Privacy-Preserving Proximity Tracing; PEPP-PT: Pan-European Privacy-Preserving Proximity Tracing; QR: Quick Response.