title: The sodium concentration of parotid saliva in "hard" drug addicts.
mesh_terms: D000293:Adolescent; D000328:Adult; D003937:Diagnosis, Differential; D004566:Electrodes; D006556:Heroin Dependence / Q000175:diagnosis*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008691:Methadone; D010306:Parotid Gland / Q000378:metabolism*; D012463:Saliva / Q000032:analysis*; D012472:Salivation; D012964:Sodium / Q000032:analysis*; D013375:Substance Withdrawal Syndrome / Q000175:diagnosis*; D019966:Substance-Related Disorders / Q000175:diagnosis*
chemical_list: D012964:Sodium; D008691:Methadone