title: MSIS celebrates 40 years.
authors.forename: Astrid
authors.initials: A
authors.lastname: Løvlie
authors.forename: Hans
authors.initials: H
authors.lastname: Blystad
authors.forename: Tone
authors.initials: T
authors.lastname: Bruun
mesh_terms: D003141:Communicable Diseases / Q000453:epidemiology; D062665:Epidemiological Monitoring; D049673:History, 20th Century; D006801:Humans; D009664:Norway / Q000453:epidemiology; D012042:Registries; D018571:Sentinel Surveillance