title: Middle school students' sources of acquiring cigarettes and requests for proof of age.
authors.affiliation: Section Adolescent Medicine, St Christopher's Hospital for Children, MCP-Hahnemann School of Medicine.
authors.forename: P K
authors.initials: PK
authors.lastname: Braverman
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D002648:Child; D003132:Commerce / Q000331:legislation & jurisprudence; D006801:Humans; D010947:Plants, Toxic; D012309:Risk-Taking; D012907:Smoking / Q000453:epidemiology* / Q000331:legislation & jurisprudence; D014026:Nicotiana; D014481:United States