48,XXYY, 48,XXXY and 49,XXXXY syndromes: not just variants of Klinefelter syndrome.
Tartaglia, Nicole; Ayari, Natalie; Howell, Susan; D'Epagnier, Cheryl; Zeitler, Philip; Acta Paediatrica, 2011, vol. 100, issue 6, p 851, ISSN 08035253. ISBN 16512227.

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