title: [Mass screening for breast cancer at Leiden. Preliminary report].
mesh_terms: D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008207:Lymphatic Metastasis; D008403:Mass Screening; D008875:Middle Aged; D009426:Netherlands
vernacular_title: Bevolkingsonderzoek op borstkanker te Leiden. Voorlipig verslag