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Hettema JM, An SS, van den Oord EJ, Neale MC, Kendler KS, Chen X.Hettema JM, et al. Among authors: kendler ks.Am J Med Genet B Neuropsychiatr Genet. 2008 Jul 5;147B(5):661-6. doi: 10.1002/ajmg.b.30656.Am J Med Genet B Neuropsychiatr Genet. 2008.PMID: 18163385Free PMC article.