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Guttmacher S, Weitzman B, Kapadia F, Weinberg S. 2002. Classroom-based surveys of adolescent risk-taking behaviors: Reducing the bias of absenteeism. American Journal of Public Health. 235-237.(Case Study)
Ragan L. 2002. Consent issues in school-based health research. Research Update. Alberta Cancer Board. 9(1). (Case Study)
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