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Epidermal growth factor (EGF) has been proposed as a candidate biomarker for cognitive impairment in Parkinson’s disease (PD). We aimed to assess the relationship between serum EGF and cognitive functions in early, drug-naive PD patients and evaluate the predictive value of EGF on cognitive functions in a 2-year follow-up study. Serum EGF was measured in 65 early, drug-naive PD patients, that underwent...
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