title: [Regional differences in infant mortality, 1961-1964].
mesh_terms: D005260:Female; D005313:Fetal Death; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007231:Infant, Newborn; D009664:Norway; D011247:Pregnancy; D012189:Retrospective Studies
vernacular_title: Regionale variasjoner i spedbarnsdødeligheten i 1961-1964.