Issues of validity and population coverage in student surveys of drug use.
D000041:Absenteeism; D000293:Adolescent; D003219:Confidentiality; D003430:Cross-Sectional Studies; D004812:Epidemiologic Methods; D006801:Humans; D012494:Sampling Studies; D013332:Student Dropouts; D019966:Substance-Related Disorders / Q000453:epidemiology*; D014342:Truth Disclosure; D014481:United States