Donna Martin - Labour in summary: Stage 1 - Latent Phase 0 -4 cms. Cervix long, starting to efface. Active Phase 4 - 7cms. Cervix thin Transition Phase 8 - 10cms, cervix
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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 - eClinicalMedicine
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