title: Letter: Cystic fibrosis and absence of vas deferens.
mesh_terms: D000013:Congenital Abnormalities / Q000150:complications; D003550:Cystic Fibrosis / Q000150:complications; D006801:Humans; D007248:Infertility, Male / Q000209:etiology*; D008297:Male; D014649:Vas Deferens / Q000002:abnormalities*