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Lang AE, Langston JW, Stoessl AJ, Brodsky M, Brooks DJ, Dhawan V, Elias WJ, Lozano AM, Moro E, Nutt JG, Stacy M, Turner D, Wooten GF. GDNF in treatment of Parkinson's disease: response to editorial. Lancet Neurol. 2006 Mar;5(3):200–202.