Silva, Ana Inês, et al. “Parturients With COVID-19 Undergoing Anaesthesia or Analgesia for Labor, Delivery or Cesarean Section: A Retrospective Observational Study”. Journal of the Portuguese Society of Anesthesiology, vol. 29, no. 4, Jan. 2021, pp. 192-8, doi:10.25751/rspa.20941.