Cervical pessaries for prevention of preterm birth in women with a multiple pregnancy (ProTWIN): a multicentre, open-label randomised controlled trial by Liem, Sophie, Dr, Schuit, Ewoud, PhD, Hegeman, Maud, MD, Bais, Joke, PhD, de Boer, Karin, PhD, Bloemenkamp, Kitty, PhD, Brons, Jozien, PhD, Duvekot, Hans, PhD, Bijvank, Bas Nij, MD, Franssen, Maureen, PhD, Gaugler, Ingrid, PhD, de Graaf, Irene, PhD, Oudijk, Martijn, PhD, Papatsonis, Dimitri, PhD, Pernet, Paula, MD, Porath, Martina, PhD, Scheepers, Liesbeth, PhD, Sikkema, Marko, PhD, Sporken, Jan, PhD, Visser, Harry, PhD, van Wijngaarden, Wim, PhD, Woiski, Mallory, MD, van Pampus, Mariëlle, PhD, Mol, Ben Willem, Prof, Bekedam, Dick, PhD

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