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Environmental Risk Factors for Parkinson's Disease and Parkinsonism: The Geoparkinson StudyF. D. Dick, G. De Palma, A. Ahmadi, N. W. Scott, G. J. Prescott, J. Bennett, S. Semple, S. Dick, C. Counsell, P. Mozzoni, N. Haites, S. Bezzina Wettinger, A. Mutti, M. Otelea, A. Seaton, P. Söderkvist and A. Felice · Occupational and Environmental Medicine · 2007