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MLA Citation
Vilma L. Johnsson et al.. “Plasma progesterone, estradiol, and unconjugated estriol concentrations in twin pregnancies: Relation with cervical length and preterm delivery.” Acta obstetricia et gynecologica Scandinavica, vol. 98, 2019, pp. 86–94. http://access.bl.uk/ark:/81055/vdc_100075587888.0x000064