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. 2020 Jul 9;10(7):76. doi: 10.3390/bios10070076

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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/).

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SPEs printed on flower (a), skull (b), panda bear (c), and marijuana (d) shapes. SPEs fabricated on a temporary tattoo (e), bendable bandage (f), textile substrate (g), glove (h), water-soluble silk thin-film substrates (transferred to tooth enamel) (i), contact lens (j), or incorporated in a mouthguard (k), eyeglasess (l) or ring (m). Reprinted and adapted with permission of Springer [68] (e,j,k) Wiley [81] (f), Elsevier [82] (a,g), Elsevier [82](b), Wiley [83] (c), Wiley [65] (h), Nature Research [84] (i), Elsevier [85] (l), and Elsevier [86] (c,m).