This article, published as an advance online publication in 2014, Reference Birnbaum, Daily, O’Rourke and Loretti1 is a preliminary version of an article later published in its final form in Prehospital and Disaster Medicine 30(5). Reference Birnbaum, Daily, O’Rourke and Loretti2 This earlier version is made redundant by the existence of the authoritative version that appeared in the issue. Cambridge University Press apologizes for any confusion this may have caused and retracts the preliminary version of the article.
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