title: Theoretical and practical considerations of Klinefelter's syndrome in children. A report of three cases of 47 XXY.
mesh_terms: D000293:Adolescent; D000818:Animals; D002648:Child; D002652:Child Behavior; D002657:Child Development; D006801:Humans; D007713:Klinefelter Syndrome / Q000175:diagnosis; D008297:Male; D010553:Personality Development; D011627:Puberty