Corrigenda and Addenda
In “Estimated Sleep Duration Before and During the COVID-19 Pandemic in Major Metropolitan Areas on Different Continents: Observational Study of Smartphone App Data” (J Med Internet Res 2021;23(2):e20546) the authors noted one error.
In the originally published paper, the name of one author cited in Reference 25 (Czeisler MÉ) was incomplete. The list of authors cited in Reference 25 originally appeared as follows:
Czeisler M, Howard ME, Robbins R, Barger LK, Facer-Childs ER, Rajaratnam SM, et al.
In the corrected version of the paper, the list of authors appears as follows:
Czeisler MÉ, Howard ME, Robbins R, Barger LK, Facer-Childs ER, Rajaratnam SM, et al.
The correction will appear in the online version of the paper on the JMIR Publications website on February 22, 2021, together with the publication of this correction notice. Because this was made after submission to PubMed, PubMed Central, and other full-text repositories, the corrected article has also been resubmitted to those repositories.
Edited by G Eysenbach; This is a non–peer-reviewed article. submitted 18.02.21; accepted 18.02.21; published 22.02.21Copyright
©Rebecca Robbins, Mahmoud Affouf, Matthew D Weaver, Mark É Czeisler, Laura K Barger, Stuart F Quan, Charles A Czeisler. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 22.02.2021.
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.