title: Level curves in Lexis diagrams.
authors.forename: N
authors.initials: N
authors.lastname: Keiding
mesh_terms: D004812:Epidemiologic Methods; D005858:Germany; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D011159:Population Surveillance / Q000379:methods*; D013223:Statistics as Topic / Q000266:history