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Hammock E, Veenstra-VanderWeele J, Yan Z, Kerr TM, Morris M, Anderson GM, Carter CS, Cook EH, Jacob S.Hammock E, et al.J Am Acad Child Adolesc Psychiatry. 2012 Jul;51(7):712-721.e1. doi: 10.1016/j.jaac.2012.04.010. Epub 2012 May 26.J Am Acad Child Adolesc Psychiatry. 2012.PMID: 22721594Free PMC article.