Elias ACGP, Matsuo T, Grion CMC, Cardoso LTQ, Verri PH. POSSUM scoring system for predicting mortality in surgical patients. Rev. Esc. Enferm. USP [Internet]. 2009 Mar. 1 [cited 2024 May 20];43(1):23-9. Available from: https://www.revistas.usp.br/reeusp/article/view/40322