title: Prepubertal Klinefelter syndrome: a report of six cases.
mesh_terms: D000293:Adolescent; D002610:Cheek; D002648:Child; D006801:Humans; D007361:Intelligence Tests; D007713:Klinefelter Syndrome; D007858:Learning; D008297:Male; D009061:Mouth Mucosa / Q000032:analysis; D011627:Puberty; D012728:Sex Chromatin / Q000032:analysis; D013737:Testis