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. 2013 Jan 10;8(1):e53580. doi: 10.1371/journal.pone.0053580

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© 2013 Fu et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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3D model of each vertebra was reconstructed in Mimics software. The 2 cylinders with 2 mm-diameters were then imported and their locations were ensured at the central cervical pedicle by visual observation. With the tool “subtraction” under “Boolean operation” in the Geomagic studio® software, the 3D model of the cervical vertebrae with bilateral pin tracts was obtained and saved in group 1 in (.stl) file format.