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. 2021 Nov 19;9:754861. doi: 10.3389/fpubh.2021.754861

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Copyright © 2021 Fredriksson and Hallberg.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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COVID-19 testing rate per 100,000 in four Nordic countries during 2020, Weeks 1–53, 2020. https://www.ecdc.europa.eu/en/publications-data/COVID-19-testing.