title: High-performance liquid chromatographic determination of L-3,4-dihydroxy-phenylalanine (L-DOPA) and its metabolites in the urine of patients with Parkinson's disease, control patients and normal subjects after oral administration of L-DOPA.
mesh_terms: D000328:Adult; D000368:Aged; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D005260:Female; D006801:Humans; D007980:Levodopa / Q000652:urine*; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000652:urine*
chemical_list: D007980:Levodopa