Yes, I've just read the second link, Rusty!
It is enhances what was said in the first link and is clearer.
I do not know a great deal about Parkinson's disease, but I was puzzled by no mention of tremors?
I have only known a few people suffering from this disease, but tremors (a slight to very bad shaking) seem to be a prominent symptom?
I must do some more research tomorrow!