Timing of active phase labor arrest diagnosis in nulliparous women: a cost-effectiveness analysis. - Schmidt EM; Hersh AR; Tuuli M; Cahill AG; Caughey AB (The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians, 2022)