2021. Supplementum 254: SwissAnaesthesia 2021, Abstracts of the joint annual congress of the Swiss Society for Anaesthesiology and Resuscitation and the Swiss Association of Nurse Anesthesists (Geneva, Switzerland, October 28−30, 2021). Swiss Medical Weekly. 151, 4344 (Oct. 2021), Suppl. 254. DOI:https://doi.org/10.4414/SMW.2021.w30095.