Información del artículo
The Publisher regrets that this article is an accidental duplication of an article that has already been published, https://doi.org/10.1016/j.gaceta.2020.05.001
The duplicate article has therefore been withdrawn.
The full Elsevier Policy on Article Withdrawal can be found at https://www.elsevier.com/about/our-business/policies/article-withdrawal
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