PMP22 and diabetes mellitus: CIDP+DM subjects had higher systolic blood pressures (p = 0.04), higher lower limb vibration potential thresholds (VPT) (right p = 0.004, left p = 0.01), and more abnormal sensory testing as indicated by Toronto Clinical Neuropathy Score (TCNS) (p = 0.0009) than CIDP-DM subjects.