Patient intermittent epidural boluses (PIEB) plus very low continuous epidural infusion (CEI) versus patient-controlled epidural analgesia (PCEA) plus continuous epidural infusion (CEI) in primiparous labour: a randomized trial - Rodríguez-Campoó, MB; Curto, A; González, M (J Clin Monit Comput, 2019)
et al.