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Johnsson, Vilma L., Pedersen, Nina G., Rode, Line, Worda, Katharina, Krampl-Bettelheim, Elisabeth, Skibsted, Lillian, Hinterberger, Stefan, Strobl, Isolde, Bowman, Maria E., Smith, Roger, Tabor, Ann. John Wiley & Sons; 2019. Plasma progesterone, estradiol, and unconjugated estriol concentrations in twin pregnancies: relation with cervical length and preterm delivery.