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Figure 3: Somatosensory - evoked potential study (a): Trace 1 shows low amplitude but present Erbs point potential. Cervical and cortical responses are not obtained (traces 2 and 3)(b) Normal Erbs point, cervical cord, and cortical responses

Figure 3: Somatosensory - evoked potential study (a): Trace 1 shows low amplitude but present Erbs point potential. Cervical and cortical responses are not obtained (traces 2 and 3)(b) Normal Erbs point, cervical cord, and cortical responses