title: Letter: Systemic lupus erythematosus and Klinefelter's syndrome.
mesh_terms: D000328:Adult; D000367:Age Factors; D005260:Female; D006801:Humans; D007713:Klinefelter Syndrome / Q000150:complications*; D008180:Lupus Erythematosus, Systemic / Q000209:etiology / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D012737:Sex Factors