title: The natural history of Parkinson's disease.
mesh_terms: D000203:Activities of Daily Living; D003704:Dementia / Q000628:therapy; D004401:Dysarthria / Q000628:therapy; D005684:Gait; D006801:Humans; D007980:Levodopa / Q000627:therapeutic use; D009069:Movement Disorders / Q000628:therapy; D009127:Muscle Rigidity / Q000628:therapy; D010300:Parkinson Disease / Q000601:surgery / Q000628:therapy*; D013788:Thalamus / Q000601:surgery; D013997:Time Factors; D014202:Tremor / Q000628:therapy
chemical_list: D007980:Levodopa