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According to our editorial policy, a competing interest exists when professional judgment concerning the validity of research is influenced by a secondary interest, such as financial gain. If there is no conflict of interest, authors should state, ¡°The author(s) declare(s) that there is no conflict of interest regarding the publication of this paper.¡± If this is the case, please include the statement in the PDF of the manuscript, and send it to me as an email attachment.
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