Treatment of hemorrhoids is divided by the cause of symptoms, into internal and external treatments. Accurately classifying a patient's symptoms and the relation of the symptoms to internal and external hemorrhoids is important.
Note also that the average life expectancy after being diagnosed with Parkinson's is about 9 years -- hence, those who participated were already at this point at the beginning of the study.
The development of dementia is slow. Typically, people that develop symptoms of dementia do so about 10 to 15 years after the initial diagnosis of Parkinson's disease. About 500,000 people in the United States have Parkinson's disease, and about 50,000 new cases are diagnosed each year.