title: Factor-analytic studies of the symptoms of Parkinson's disease.
mesh_terms: D001341:Autonomic Nervous System; D005163:Factor Analysis, Statistical; D005500:Follow-Up Studies; D007839:Functional Laterality; D006801:Humans; D009069:Movement Disorders; D009135:Muscular Diseases; D009422:Nervous System Diseases; D010300:Parkinson Disease / Q000175:diagnosis* / Q000601:surgery; D011336:Probability; D013064:Speech Disorders; D013238:Stereotaxic Techniques; D013788:Thalamus / Q000601:surgery; D014202:Tremor