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Bair E, Brownstein NC, Ohrbach R, Greenspan JD, Dubner R, Fillingim RB, Maixner W, Smith SB, Diatchenko L, Gonzalez Y, Gordon SM, Lim P, Ribeiro-Dasilva M, Dampier D, Knott C, Slade GD. Study Protocol, Sample Characteristics, and Loss to Follow-Up: The OPPERA Prospective Cohort Study. The Journal of Pain. 2013 Dec;14(12):T2–T19. doi: 10.1016/j.jpain.2013.06.006. |