title: Drug use and young people: why is co-morbidity research so important?
authors.forename: H
authors.initials: H
authors.lastname: Zeitlin
mesh_terms: D000293:Adolescent; D015897:Comorbidity; D017831:Diagnosis, Dual (Psychiatry); D006801:Humans; D001523:Mental Disorders / Q000453:epidemiology* / Q000523:psychology; D012649:Self Concept; D019966:Substance-Related Disorders / Q000453:epidemiology / Q000523:psychology*