Drug prevention in elementary schools: an introduction to the special issue.
Ringwalt
Chris
C
Pacific Institute for Research and Evaluation, Chapel Hill, North Carolina 27514, USA. Ringwalt@pire.org
Hecht
Michael L
ML
Hopfer
Suellen
S
D002648:Child; D015438:Health Behavior; D006266:Health Education; D006801:Humans; D012572:School Health Services / Q000458:organization & administration*; D019966:Substance-Related Disorders / Q000453:epidemiology / Q000517:prevention & control* / Q000523:psychology; D014481:United States / Q000453:epidemiology