title: Lip muscle function in Parkinsonian Dysarthria.
mesh_terms: D004295:Dihydroxyphenylalanine / Q000494:pharmacology; D004576:Electromyography; D005152:Facial Muscles / Q000187:drug effects / Q000503:physiopathology*; D005500:Follow-Up Studies; D006801:Humans; D008046:Lip / Q000503:physiopathology*; D008875:Middle Aged; D009043:Motor Activity / Q000187:drug effects; D010291:Paresis; D010300:Parkinson Disease / Q000503:physiopathology*; D013064:Speech Disorders / Q000503:physiopathology*; D013238:Stereotaxic Techniques; D014202:Tremor
chemical_list: D004295:Dihydroxyphenylalanine