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There is a reference at the bottom of the handout. This is available at a medical library or possibly at your local hospital. Just in case you missed it: The best reference is: Neurologic Clinics "Parkinson's Disease" May 1992, Editors JM Cedarbaum, ST Gancher, Publisher WB Saunders, Harcourt Brace. Page 341. I hope this helps you. Steve52N.aol.com (Steve Norris)