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. 2021 Mar 19;9(3):287. doi: 10.3390/vaccines9030287

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The reason why the participant would not accept a free vaccination with an effectiveness of 60% and 80%, against COVID-19, one (1) being the least important and five (5) the most important (2–4) intermediate choices.