I need to learn about environmental causes of parkinson`s. Is this idea valid? Would knowing that your PK was caused by clordane make any difference in your treatment? Was the German study by Seidler A, et al.: Possible environmental, occupational, and other etiologic factors for Parkinson`s disease. Neurology 46: 1275-84, 1996 a good study? [log in to unmask]