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Annals of Epidemiology > 2012 > 22 > 2 > 120-125
Economics and Human Biology > 2010 > 8 > 1 > 80-87
Journal of Adolescent Health > 2006 > 39 > 3 > 346-352
Annals of Epidemiology > 2012 > 22 > 2 > 120-125
Economics and Human Biology > 2010 > 8 > 1 > 80-87
Journal of Adolescent Health > 2006 > 39 > 3 > 346-352