title: Heterogeneity of Parkinson's disease.
authors.forename: A
authors.initials: A
authors.lastname: Schrag
authors.forename: N P
authors.initials: NP
authors.lastname: Quinn
authors.forename: Y
authors.initials: Y
authors.lastname: Ben-Shlomo
mesh_terms: D000368:Aged; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D018450:Disease Progression; D005260:Female; D006801:Humans; D008131:London; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000145:classification / Q000175:diagnosis* / Q000453:epidemiology