Sheng Z, Sun H, Liu J, Qian X, et al. Comparative dose--response study on norepinephrine infusion for preventing
hypotension during spinal anaesthesia for caesarean delivery in singleton versus
twin pregnancies: A randomized, double-blind, controlled, dose-finding trial. Eur J Anaesthesiol 2021;38:895-897.
PMID: 34226419