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The notion that Parkinson's disease might be caused or promoted by environmental factors is suggested by a joint study conducted by American and Chinese neurologists.

The study compared 100 Chinese with Parkinson's disease to 200 others who weren't afflicted. It was found that Chinese who were exposed to industrial chemicals were four times more likely to have the disease than those who lived in rural areas.

"We conducted our study in China because the industrialization of much of the nation has occurred only during the last two decades," said Dr. Caroline Tanner of Rush-Presbyterian-St. Luke's Medical Center, Chicago.

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