A+	amyloidosis
AD	Alzheimer’s disease
ANCOVA	analysis of covariance
ANOVA	analysis of variance
Aβ	amyloid beta protein
CI	confidence interval
CNS	central nervous system
COMT-I	catechol-o-methyltransferase inhibitors
CSF	cerebrospinal fluid
CTRL	control subjects
DA	dopamine agonists
DLB	dementia with Lewy bodies
ELISA	enzyme-linked immunosorbent assay
H&Y	Hohen and Yahr scale
LB	Lewy bodies
L-dopa	levodopa
LEDD	levodopa Equivalent Daily Dose
LP	lumbar puncture
MAO-B-I	monoamine oxidase inhibitors
MCI	mild cognitive impairment
MMSE	mini-Mental State Examination
MoCA	Montreal Cognitive Assessment
N+	neurodegeneration
NIA-AA	National Institute on Aging—Alzheimer’s Association
PD	Parkinson’s Disease
PDD	Parkinson’s Disease with dementia
PD-MCI	Parkinson’s Disease with mild cognitive impairment
PD-nMCI	cognitively unimpaired Parkinson’s Disease
PD-T	treated PD patients
PET	positron emission tomography
p-tau	tau protein phosphorylated at threonine 181
T+	tauopathy
t-tau	total tau protein