Quantification of Brain β-Amyloid Load in Parkinson's Disease With Mild Cognitive Impairment: A PET/MRI Study. Alzforum, 25 Mar 2022 Garon M, Weis L, Fiorenzato E, Pistonesi F, Cagnin A, Bertoldo A, Anglani M, Cecchin D, Antonini A, Biundo R.