Swiss Medical Weekly 2021. Supplementum 253: Abstracts of the annual congress of the Swiss Society of Gastroenterology, Swiss Visceral Surgeons, Swiss Association for the Study of the Liver and Swiss Society of Endoscopy Nurses and Associates. Swiss Medical Weekly. 151, 3536 (Sep. 2021), w30060. DOI:https://doi.org/10.57187/SMW.2021.w3006.