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. 2020 Jan 15;20:14. doi: 10.1186/s12903-020-1000-5

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© The Author(s). 2020

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Test characteristic curve of the Greek Oral Health Literacy Scale, with theta values corresponding to the quartile limits of the index score distribution (9, 12 and 14) among the 282 study participants