Association of body mass index and maternal age with first stage duration of labour by Louise Lundborg, Xingrong Liu, Katarina Åberg, Anna Sandström, Ellen L. Tilden, Olof Stephansson, Mia Ahlberg

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First stage progression in women with spontaneous onset of labor: A large population-based cohort study. by Louise Lundborg, Katarina Åberg, Anna Sandström, Andrea Discacciati, Ellen L Tilden, Olof Stephansson, Mia Ahlberg

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The duration of spontaneous active and pushing phases of labour among 75,243 US women when intervention is minimal: A prospective, observational cohort study by Ellen L. Tilden, Jonathan M Snowden, Marit L. Bovbjerg, Melissa Cheyney, Jodi Lapidus, Jack Wiedrick, Aaron B. Caughey

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First stage of labour duration and associated risk of adverse neonatal outcomes by Louise Lundborg, Katarina Åberg, Anna Sandström, Xingrong Liu, Ellen L. Tilden, Jenny Bolk, Linnea V. Ladfors, Olof Stephansson, Mia Ahlberg

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