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. 2018 May 9;8:7395. doi: 10.1038/s41598-018-25750-9

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© The Author(s) 2018

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Finite element model used to apply boundary conditions along the three orthogonal directions. The pink arrow represents the position and direction of the displacement constraint (the constraint size is 1%), and the blue mark shows that the surface of the mark is completely constrained.