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. 2017 Feb 25;9(3):82. doi: 10.3390/polym9030082

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© 2017 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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Surface cytotoxicity of PET surfaces treated in various SO₂ + O₂ mixtures. * represents statistical significance (* statistically significant at p < 0.05 compared with the control. ** represents statistical significance at p < 0.01 compared with the control. *** represents statistical significance at p < 0.001 compared with the control). Mean values ( ± SE) for the respective triplicates are given.