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. 2020 Feb 5;13(3):705. doi: 10.3390/ma13030705

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© 2020 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/).

PMC Copyright notice

(a) FESEM image of TiO₂ nanotubes and (b) GelGOHA composite coating on titanium. (c) Cross-section of TiO₂ nanotubes and (d) GelGOHA coating on titanium. (Reprinted with permission from [40], Elsevier 2015 copyright n. 4710121336953).