title: The age of onset of Parkinson's disease: etiological implications.
abstract: We have conducted a hospital-based survey of the age-specific prevalence of Parkinson's disease in 551 patients from Helsinki and Vancouver. We conclude that the disorder may be starting earlier than previously and we discuss the implications of this finding for the etiology of Parkinson's disease.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D001955:British Columbia; D005387:Finland; D006801:Humans; D008875:Middle Aged; D010300:Parkinson Disease / Q000453:epidemiology*; D012189:Retrospective Studies