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In a small prospective study assessing 10 symptomatic and 10 asymptomatic subjects, Schellhas et al. compared cervical discography to magnetic resonance imaging. Within that study he reported on the distribution of pain for the C3–C4 to C6–C7 levels. Four years later, Grubb and Ellis reported retrospective data from his 12-year experience using cervical discography from C2–C3 to C7–T1 in 173 patients...
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