title: [Following Arvo Ylppo's footmarks].
authors.affiliation: University of Helsinki, Helsinki, Finland.
authors.forename: K
authors.initials: K
authors.lastname: Raivio
mesh_terms: D005387:Finland; D049673:History, 20th Century; D006801:Humans; D007231:Infant, Newborn; D007235:Infant, Premature, Diseases / Q000266:history; D010372:Pediatrics / Q000266:history*