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Slade GD, Bair E, By K, Mulkey F, Baraian C, Rothwell R, Reynolds M, Miller V, Gonzalez Y, Gordon S, Ribeiro-Dasilva M, Lim PF, Greenspan JD, Dubner R, Fillingim RB, Diatchenko L, Maixner W, Dampier D, Knott C, Ohrbach R. Study Methods, Recruitment, Sociodemographic Findings, and Demographic Representativeness in the OPPERA Study. The Journal of Pain. 2011 Nov;12(11):T12–26. doi: 10.1016/j.jpain.2011.08.001. |