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© 2018 London School of Economics and Political Science. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/).
Excepto si se señala otra cosa, la licencia del ítem se describe como: © 2018 London School of Economics and Political Science. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/).