Prognostic value of cervical length for spontaneous preterm birth in asymptomatic women with twin pregnancy: meta-analysis of individual participant data by Rui Wang, Ben W Mol, Shakila Thangaratinam, Anna Lene Seidler, Mariarosaria Di Tommaso, Mason Aberoumand, Lukas Staub, Lindsay Kindinger, Kelly Margaret Hughes, Phoebe Swan, Mona Aboulghar, Maria de Lourdes Brizot, Clifton Brock, Marta Benito Vielba, Nathan Fox, Cynthia Gyamfi-Bannerman, Giorgio Pagani, Alfredo Perales Marin, Viola Seravalli, Omer Weitzner, Katharina Worda, Shaun Brennecke

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