A study by Pezzoli and Cereda was reported in Neurology, May 28, 2013. The report said that the use of pesticides is associated with the development of Parkinson’s disease, which is a neurological disease that causes people to shake. The study reported that exposure to bug killers and weed killers is “associated with” an increase of 33% to 80% in the chances of getting Parkinson’s. Does this study show that pesticides cause Parkinson’s disease? Why or why not?