"Klinefelter's syndrome in children." . . . . . "Proposal to amend the Lanterman Act : advocacy for children with Klinefelter syndrome/XXY and other disabling chromosome aneuploidies"@en . . . . . . . . . . . "Proposal to amend the Lanterman Act Advocacy for children with Klinefelter Syndrome/XXY and other disabling Chromosome Aneuploidies" . "Sex chromosome abnormalities in children." . . "Developmental disabilities." . . . .