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Genetic influences on childhood competencies: a twin study.
Hudziak JJ, Copeland W, Rudiger LP, Achenbach TM, Heath AC, Todd RD. Hudziak JJ, et al. J Am Acad Child Adolesc Psychiatry. 2003 Mar;42(3):357-63. doi: 10.1097/00004583-200303000-00017. J Am Acad Child Adolesc Psychiatry. 2003. PMID: 12595790
Comparisons of problems reported by youths from seven countries.
Verhulst FC, Achenbach TM, van der Ende J, Erol N, Lambert MC, Leung PW, Silva MA, Zilber N, Zubrick SR. Verhulst FC, et al. Am J Psychiatry. 2003 Aug;160(8):1479-85. doi: 10.1176/appi.ajp.160.8.1479. Am J Psychiatry. 2003. PMID: 12900311