ENO2 and neuropathy: ALA - alpha-lipoic acid, FBS - fasting blood sugar, GSH - glutathione, HbA1C - glycated hemoglobin, hs-CRP - high-sensitivity C-reactive protein, MDA - malondialdehyde, NO - nitric oxide, NSE - neuron-specific enolase, NTSS-6 - Neuropathy Total Symptom Score 6, PPBS - postprandial blood sugar, SF-12 - 12-Item Short Form Health Survey, VPT - vibration perception threshold