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PDF Availablehttps://doi.org/10.1136/bmjopen-2014-007485
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Cite Journal: BMJ Open |  Publication Date: Oct 1, 2015 |
 Citations: 20 |  License type: open-access |
ObjectivesWe aimed to evaluate the validity of the self-reported smoking indicator used in the Global Youth Tobacco Survey (GYTS).Setting43 middle and high-school classrooms from 26 schools were selected from Mexico...
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