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El editor lamenta que este artículo es un duplicado accidental de un artículo que ya ha sido publicado en la revista Chest 136 (2009) 433–439, http://dx.doi.org/10.1378/chest.09-0706. El artículo duplicado será retirado.
The Publisher regrets that this article is an accidental duplication of an article that has already been published in Chest 136 (2009) 433–439, http://dx.doi.org/10.1378/chest.09-0706. The duplicate article has therefore been withdrawn.
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