Technical comment on: Güller et al. Lower hospital volume is associated with higher mortality after oesophageal, gastric, pancreatic and rectal cancer resection. Swiss Med Wkly [Internet]. 2018 Jan. 4 [cited 2026 Jan. 12];148(0102):w14582. Available from: https://www.smw.ch/index.php/smw/article/view/2428