48,XXYY, 48,XXXY and 49,XXXXY syndromes: not just variants of Klinefelter syndrome.
Tartaglia N; Ayari N; Howell S; D'Epagnier C; Zeitler P; Acta Paediatrica (Oslo, Norway: 1992), 2011, vol. 100, issue 6, p 851, ISSN 16512227. ISBN 16512227.

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