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Arnold DH, Gebretsadik T, Abramo TJ, Sheller JR, Resha DJ, Hartert TV.Arnold DH, et al.Emerg Med J. 2012 Jun;29(6):444-50. doi: 10.1136/emj.2010.110957. Epub 2011 May 17.Emerg Med J. 2012.PMID: 21586757Free PMC article.