AD	Alzheimer’s disease
AUC	area under a curve
CF	choroidal fissure
ECCS	extracranial colour coded duplex sonography
FDG	fluorodeoxyglucose
CSF	cerebrospinal fluid
GDS	geriatric depression scale
ICC	intraclass correlations
IQR	interquartile range
MMSE	mini-mental state examination
MRI	magnetic resonace imaging
MTL	medial temporal lobe
PET	positron emission tomography
ROC	receiver operating characteristic
TCCS	transcranial color-coded duplex sonography
TCS	transcranial sonography