title: [The XXXY-syndrome. Two new observations in young children and a literary review].
mesh_terms: D000015:Abnormalities, Multiple; D002675:Child, Preschool; D003456:Cryptorchidism; D003937:Diagnosis, Differential; D006177:Gynecomastia; D006801:Humans; D007006:Hypogonadism; D008607:Intellectual Disability; D007713:Klinefelter Syndrome / Q000145:classification; D008297:Male; D012728:Sex Chromatin; D012729:Sex Chromosome Aberrations / Q000145:classification / Q000175:diagnosis / Q000209:etiology
vernacular_title: Das XXXY-Syndrom. Zwei neue Beobachtungen im Kleinkindesalter und eine Literaturübersicht.