title: Improved resolution using capillary columns.
mesh_terms: D002849:Chromatography, Gas / Q000379:methods*; D004295:Dihydroxyphenylalanine / Q000652:urine; D005069:Evaluation Studies as Topic; D006801:Humans; D006838:Hydrocarbons / Q000032:analysis; D010300:Parkinson Disease / Q000652:urine; D010636:Phenols / Q000652:urine; D013997:Time Factors
chemical_list: D006838:Hydrocarbons; D010636:Phenols; D004295:Dihydroxyphenylalanine