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. 2018 Aug 29;5(3):70. doi: 10.3390/bioengineering5030070

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© 2018 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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Principal sketch of the specimen. The specimen consists of steel rods that were embedded in epoxy resin. The cylindrical steel rods had a diameter of 1.5 mm.