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. 2018 Jul 3;29(7):106. doi: 10.1007/s10856-018-6106-9

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© The Author(s) 2018

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 8 — Mean value of the peak stress in the circumferential (a) and axial directions (b) (average ± SD) in the study groups. The same letters (a, b) indicate homogeneous groups within individual valves (Tukey’s test, P < 0.05; N = 8–10)