title: The frequency of imperforate hymen in northern Italy.
authors: F
authors: F
authors: Parazzini
authors: G
authors: G
authors: Cecchetti
mesh_terms: D000328:Adult; D000013:Congenital Abnormalities / Q000453:epidemiology; D005260:Female; D006801:Humans; D006924:Hymen / Q000002:abnormalities*; D007558:Italy / Q000453:epidemiology