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Samuels SE, Bullock SL, Woodward-Lopez G, Clark SE, Kao J, Craypo L, Barry J, Crawford PB.Samuels SE, et al.J Adolesc Health. 2009 Sep;45(3 Suppl):S38-44. doi: 10.1016/j.jadohealth.2009.03.015. Epub 2009 May 28.J Adolesc Health. 2009.PMID: 19699435