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. 2022 Mar 29;14(4):732. doi: 10.3390/pharmaceutics14040732

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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Mean coefficient of friction calculated for ODF samples for BTM tribological testing (n = 3), with one-way ANOVA statistical significance data displayed—**** (p < 0.0001) and ns (not significant).