Adult 2 Analgesia, Epidural 2 Analgesia, Obstetrical Delivery, Obstetric 2 Female 2 Humans 2 Labor, Obstetric 2 Pregnancy 2 adult 2 epidural analgesia 2 female 2 human 2 labor 2 obstetric analgesia 2 obstetric delivery 2 pregnancy 2 vaginal delivery 2 Anesthesia, Spinal 1 Apgar score 1 Article 1 Circadian Rhythm 1 Circadian rhythm 1 Cohort Studies 1 Combined spinal-epidural 1 Drug Therapy, Combination 1 Duration of labour 1 Foetal outcome 1 Induction 1 Labor 1 Labor, Induced 1