title: Substance use among school-based youths in Puerto Rico: differences between gender and grade levels.
authors.affiliation: Johns Hopkins University, School of Hygiene and Public Health, 624 N Broadway, Suite 794, PO Box 775, Baltimore, MD 21205, USA. wlatimer@jhsph.edu
authors.forename: William W
authors.initials: WW
authors.lastname: Latimer
authors.forename: Leah J
authors.initials: LJ
authors.lastname: Floyd
authors.forename: Marco
authors.initials: M
authors.lastname: Vasquez
authors.forename: Megan
authors.initials: M
authors.lastname: O'Brien
authors.forename: Abigail
authors.initials: A
authors.lastname: Arzola
authors.forename: Nancy
authors.initials: N
authors.lastname: Rivera
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior / Q000523:psychology*; D000328:Adult; D000367:Age Factors; D000428:Alcohol Drinking / Q000453:epidemiology; D002648:Child; D004522:Educational Status; D005260:Female; D006801:Humans; D008297:Male; D008385:Marijuana Smoking / Q000453:epidemiology; D011647:Puerto Rico / Q000453:epidemiology; D012737:Sex Factors; D012907:Smoking / Q000453:epidemiology; D019966:Substance-Related Disorders / Q000453:epidemiology* / Q000517:prevention & control