(1 Minute+) An estimated seven to 10 million people worldwide are living with Parkinson's disease. The condition is a progressive disease of the nervous system. Symptoms are marked by tremor, muscular rigidity, and slow, imprecise movement, chiefly affecting middle-aged and elderly people. Famous people with Parkinson's Disease include Michael J. Fox (Entertainment, see Michael J. Fox Foundation) Robin Williams (Entertainment) Muhammad Ali (Sports) Johnny Cash (Music) Billy Graham (Religion) Casey
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