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Effect of gestational age on cord ERFE differs between newborns born to women carrying multiple fetuses (A) and newborns born to teens carrying singletons (B). Bivariate correlations between neonatal ERFE and gestational age at birth. (A) The relation between ERFE and gestational age was β: 0.01, P = 0.72 in the multiples cohort. (B) The relation between ERFE and gestational age was β: 0.09, P = 0.02 in the teen cohort. ERFE, erythroferrone.
