title: Double-blind, placebo-controlled study of levodopa therapy in Parkinson's disease.
mesh_terms: D002986:Clinical Trials as Topic; D004295:Dihydroxyphenylalanine / Q000008:administration & dosage* / Q000009:adverse effects; D004185:Disability Evaluation; D006801:Humans; D008297:Male; D008606:Mental Processes / Q000187:drug effects; D008875:Middle Aged; D009069:Movement Disorders / Q000188:drug therapy; D010300:Parkinson Disease / Q000188:drug therapy*; D010919:Placebos; D014202:Tremor / Q000188:drug therapy
chemical_list: D010919:Placebos; D004295:Dihydroxyphenylalanine