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Taggart E, Doran S, Kokotillo A, Campbell S, Villa-Roel C, Rowe BH.Taggart E, et al. Among authors: campbell s.Headache. 2013 Feb;53(2):277-87. doi: 10.1111/head.12009. Epub 2013 Jan 8.Headache. 2013.PMID: 23298250Review.
Moe J, Kirkland S, Ospina MB, Campbell S, Long R, Davidson A, Duke P, Tamura T, Trahan L, Rowe BH.Moe J, et al. Among authors: campbell s.Emerg Med J. 2016 Mar;33(3):230-6. doi: 10.1136/emermed-2014-204496. Epub 2015 May 7.Emerg Med J. 2016.PMID: 25953837Review.