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Copyright © 2013 Salvador Hernandez et al. This is an open access article distributed under the Creative Commons Attribution ´
License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly
cited.
Excepto si se señala otra cosa, la licencia del ítem se describe como: Copyright © 2013 Salvador Hernandez et al. This is an open access article distributed under the Creative Commons Attribution ´ License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.