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 average life expectancy after diagnosis of Alzheimer's is about seven to 10 years. However, there is some evidence that patients with early-onset Alzheimer's progress faster (four-to six-year average life expectancy). Moreover, there is great variability from patient to patient, so these numbers are very loose.