Tarvonen M, Hovi P, Sainio S, Vuorela P, et al. Intrapartum zigzag pattern of fetal heart rate is an early sign of fetal hypoxia:
a large obstetric retrospective cohort study. Acta Obstet Gynecol Scand 2020 Sep 27. doi: 10.1111/aogs.14007.
PMID: 32981037