Urban-rural smoking patterns in grade 7 children: the implications for health education.
D000293:Adolescent; D002648:Child; D005260:Female; D006266:Health Education; D006801:Humans; D008297:Male; D009864:Ontario; D012424:Rural Population; D012525:Saskatchewan; D012907:Smoking / Q000453:epidemiology*; D014505:Urban Population