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Showing articles 0 to 3 of 3 Filter Applied: rigidity (Click to remove) Drug Therapy of Parkinsonism NEJM 295:814, Bianchine,J.R., 1976 Diseases of the Nervous System Caused by Nutritional Deficiency, Pellagra (Niacin, Nicotinic Acid, B3 Deficiency) Adams & Victors Principles of Neurology Chp 41, pg 1170, Ropper, A.H.,et al, 2014 Update on Parkinson Disease NY State J Med, 87:147-1531987., Lieberman,A.N., 1987 Showing articles 0 to 3 of 3