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Moore, Andrew R.a,*; Eccleston, Christopherb; Derry, Sheenaa; Wiffen, Phillipc; Bell, Rae F.d; Straube, Sebastiane; McQuay, Henrya for the ACTINPAIN writing group of the IASP Special Interest Group (SIG) on Systematic Reviews in Pain Relief and the Cochrane Pain, Palliative and Supportive Care Systematic Review Group editors Author Information
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Moore et al. (2010) studied this question.
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