DOI:
10.1055/s-00000020
Geburtshilfe und Frauenheilkunde
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References
Morgen CS, Bjork C, Andersen PK et al.
Socioeconomic position and the risk of preterm birth–a study within the Danish National Birth Cohort.
Int J Epidemiol 2008;
37: 1109-1120
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