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Effects of dorsal root ganglion stimulation and spinal cord stimulation on Conditioned Place Preference test in rats with tibial nerve injury. (A) Sequence of events. (B) Preference at baseline (Pretest) and after treatment or Sham treatment, and the treatment effect normalized to the Pretest baseline. Results are mean ± SD. * P < 0.05; ** P < 0.01 by the paired t test (B) and the Tukey test after one-way ANOVA (C). n, number of animals.
