Epidemiology of preterm births and its change over time (1971-1986).
Papiernik
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Department of Obstetrics and Gynaecology, Hôpital Antoine Béclère, Clamart, France.
D005602:France; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D009359:Neonatology / Q000639:trends*