Isolated case, my FIL was a large animal vet tending to herds of cattle. The herds were often in close proximity of other ag fields that sprayed chemicals such as those cited in the JAMA article. This was in the 60s and 70s when little was known on possible PD causes. He developed PD in his mid 40s and was forced into medical retirement. After his retirement he did lots of reading about possible causes and was a firm believer that his condition may have been brought on by the environmental factors.
Just relaying his story, not here to start an argument.
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