title: Parkinson disease: Nonmotor symptoms predict quality of life in patients with early Parkinson disease.
authors.forename: Hemi
authors.initials: H
authors.lastname: Malkki
mesh_terms: D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D019957:Motor Skills Disorders / Q000175:diagnosis* / Q000523:psychology*; D010300:Parkinson Disease / Q000175:diagnosis* / Q000523:psychology*; D011788:Quality of Life / Q000523:psychology*