Silver Book Fact
More than 3/4 of Parkinson’s disease patients developed dementia during an 8-year study.
Aarsland D, Andersen K, Larsen J, Lolk A. Prevalence and Characteristics of Dementia in Parkinson Disease: An 8-year prospective study. Arch Neurol. 2003; 60(3): 387-92. http://archneur.ama-assn.org/cgi/content/full/60/3/387