title: Changes in breast cancer incidence among Norwegian women under 50.
authors.forename: I
authors.initials: I
authors.lastname: Matheson
authors.forename: S
authors.initials: S
authors.lastname: Tretli
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D001943:Breast Neoplasms / Q000453:epidemiology*; D005260:Female; D006801:Humans; D015994:Incidence; D008875:Middle Aged; D009664:Norway / Q000453:epidemiology; D012042:Registries; D012307:Risk Factors; D015996:Survival Rate