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- [5] Normal childbirth: physiologic labor support and medical procedures. Guidelines of the French National Authority for Health (HAS) with the collaboration of the French College of Gynaecologists and Obstetricians (CNGOF) and the French College of Midwives (CNSF) - Maternal postures during the second stage of labour, delivery techniques and perineal protection GYNECOLOGIE OBSTETRIQUE FERTILITE & SENOLOGIE, 2020, 48 (12): : 931 - 943