 Could you tell us a little bit about Parkinson's disease, then? Could Parkinson's affect cognition, and could it be the cause of that gait disorder, as the caller mentioned? Oh, sure. Parkinson's disease, for some people, can have significant cognitive and psychological or psychiatric effects, and it can certainly cause a shuffling and festivating gait and a range of other symptoms. And I would add, there are many other Parkinsonian syndromes that are not Parkinson's.