title: Background of the recognition of Klinefelter's syndrome as a distinct pathologic entity.
mesh_terms: D001706:Biopsy; D049673:History, 20th Century; D006801:Humans; D007713:Klinefelter Syndrome / Q000235:genetics / Q000266:history* / Q000473:pathology / Q000628:therapy; D008297:Male; D012728:Sex Chromatin / Q000032:analysis; D014481:United States