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 majority of people develop Parkinson's disease after age 60 (although a few patients like Michael J. Fox develop it at an early age of about 30 and boxer Muhammad Ali at age 42). Men are about 1.5 times more likely to develop it than women. In general, the disease slowly progresses with more pronounced symptoms developing over many years.