Silver Book Fact
At least 1/3 of patients with Parkinson’s disease develop cognitive impairment, which can be secondary to the disease itself.
Adler C. Nonmotor Complications in Parkinson’s Disease. Mov Disorders. 2005; 20(S11): 23-9. https://onlinelibrary.wiley.com/doi/abs/10.1002/mds.20460