Smoking and Parkinson's disease. An age-dependent risk effect? The EUROPARKINSON Study Group.
Tzourio C, Rocca WA, Breteler MM, Baldereschi M, Dartigues JF, Lopez-Pousa S, Manubens-Bertran JM, Alpérovitch A. Smoking and Parkinson's disease. An age-dependent risk effect? The EUROPARKINSON Study Group. Neurology. 1997 Nov; 49(5):1267-72.