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Stevens SA, Racine N, Pillai Riddell R, Horton R, Garfield H, Greenberg S.Stevens SA, et al. Among authors: garfield h.Pain Res Manag. 2013 Nov-Dec;18(6):313-8. doi: 10.1155/2013/285914.Pain Res Manag. 2013.PMID: 24308021Free PMC article.