Correction: Preventing preterm birth with progesterone: costs and effects of screening low risk women with a singleton pregnancy for short cervical length, the Triple P study by Melanie A van Os, Jeanine A van der Ven, C Emily Kleinrouweler, Eva Pajkrt, Esteriek de Miranda, Aleid van Wassenaer, Martina Porath, Patrick M Bossuyt, Kitty WM Bloemenkamp, Christine Willekes, Mallory Woiski, Martijn A Oudijk, Katia M Bilardo, Marko J Sikkema, Johannes J Duvekot, Diederik Veersema, Jacqueline Laudy, Petra Kuiper, Christianne JM de Groot, Ben Willem J Mol, Monique C Haak

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