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.
Dementia is relatively rare in people with onset of Parkinson's disease before age 50 years, even when the disease is of long duration. Dementia is more common in people with an older age (about 70 years) at onset of Parkinson's disease.