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ObjectiveTo study whether maternal age is associated with serum concentration of human chorionic gonadotropin in early pregnancy.
DesignCross‐sectional study.
SettingOslo University Hospital in Oslo, Norway.
PopulationAll vital pregnancies in gestational week 8 conceived by in vitro fertilization between February 1996 and February 2013 (n = 4472).
MethodsSerum concentrations of human chorionic...
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