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Challen K, Goodacre SW.Challen K, et al.Emerg Med J. 2011 Oct;28(10):827-37. doi: 10.1136/emj.2010.099291. Epub 2011 Jan 6.Emerg Med J. 2011.PMID: 21212227Review.
Clifford-Brown J, Challen K, Ryan B.Clifford-Brown J, et al. Among authors: challen k.Emerg Med J. 2010 Dec;27(12):931-3. doi: 10.1136/emj.2009.078774. Epub 2010 May 13.Emerg Med J. 2010.PMID: 20466832
Dunham M, Challen K, Walter D.Dunham M, et al. Among authors: challen k.Emerg Med J. 2010 Jun;27(6):461-4. doi: 10.1136/emj.2008.068163.Emerg Med J. 2010.PMID: 20562143
Challen K, Bentley A, Bright J, Gray J, Walter D.Challen K, et al.Emerg Med J. 2011 Apr;28(4):287-9. doi: 10.1136/emj.2009.083683. Epub 2010 Jun 26.Emerg Med J. 2011.PMID: 20581387
Gray JT, Challen K, Oughton L.Gray JT, et al. Among authors: challen k.Emerg Med J. 2010 Dec;27(12):943-7. doi: 10.1136/emj.2009.072959.Emerg Med J. 2010.PMID: 21076165
Challen K, Goodacre SW, Wilson R, Bentley A, Campbell M, Fitzsimmons C, Walter D.Challen K, et al.Emerg Med J. 2012 May;29(5):383-8. doi: 10.1136/emj.2010.104380. Epub 2011 May 17.Emerg Med J. 2012.PMID: 21586758