Clinical and neuropsychological assessment
The H&Y scale, the Unified Parkinson’s Disease Rating Scale (UPDRS)9 and Schwab & England scale (S&E)14 were used to evaluate the severity of PD. Cognitive assessments were performed using the Trail Making Test, parts A and B (TMT-A, TMT-B),15,16 and Stroop test, parts I and II (ST-I, ST-II)17,18 in the PD and HCO groups.