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Hustinx TW, Eberle P, Geerts SJ, Ten B, Woltring LM. Mongoloid twins with 48 chromosomes (AA plus A21XXY). Ann Hum Genet 25: 111-115, 1961.","DOI":"10.1111\/j.1469-1809.1961.tb01507.x"},{"key":"6","unstructured":"6. De Grouchy J, Emerit I, DE Gennes JL, Vernant P. Klinefelter's syndrome in a 6-year-old trisomy-21 boy. Presse Med 73: 1209-1212, 1965."},{"key":"7","unstructured":"7. Hecht F, Nievaard JE, Duncanson N, et al. Double aneuploidy: the frequency of XXY in males with Down's syndrome. Am J Hum Genet 21: 352-359, 1969."},{"key":"8","doi-asserted-by":"crossref","unstructured":"8. Erdtmann B, de Freitas AA, de Souza RP, Salzano FM. Klinefelter's syndrome and G trisomy. J Med Genet 8: 364-368, 1971.","DOI":"10.1136\/jmg.8.3.364"},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Efinski D, Duma H, Apostolovski B, Sofijanov N, Ristevski B, Darkovski S. Klinefelter's and Down's syndrome in an adolescent with abnormal EEG. Clin Genet 5: 81-85, 1974.","DOI":"10.1111\/j.1399-0004.1974.tb01665.x"},{"key":"10","unstructured":"10. Akbas E, Soylemez F, Savasoglu K, Halliogluand O, Balci S. A male case with double aneuploidy (48, XXY, +21). Genet Couns 19: 59-63, 2008."},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. Gerretsen MF, Peelen W, Rammeloo LA, Koolbergen DR, Hruda J. Double aortic arch with double aneuploidy -rare anomaly in combined Down and Klinefelter syndrome. Eur J Pediatr 168: 1479-1481, 2009.","DOI":"10.1007\/s00431-009-0958-4"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Jeanty C, Turner C. Prenatal diagnosis of double aneuploidy, 48,XXY,+21, and Review of the Literature. J Ultrasound Med 28: 673-681, 2009.","DOI":"10.7863\/jum.2009.28.5.673"},{"key":"13","unstructured":"13. Rosenthal A. Cardiovascular malformations in Klinefelter's syndrome: report of three cases. J Pediatr 80: 471-473, 1972."},{"key":"14","unstructured":"14. 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