[Objective verification of the anonymous questionnaire method used to identify schoolchildren who smoke].
D000293:Adolescent; D002248:Carbon Monoxide / Q000032:analysis*; D006801:Humans; D012907:Smoking; D011795:Surveys and Questionnaires
D002248:Carbon Monoxide
Ob'ektivnaia proverka metoda anonimnogo anketirovaniia, ispol'zovannogo v tseliakh vyiavleniia kuriashchikh shkol'nikov.