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.
With modern treatments patients with Parkinson's disease usually have a normal life expectancy, though in long-term patients the decline in brain function can exacerbate other illnesses and so contribute to the eventual cause of death.