Martins, Catarina Sampaio, and Rui Nunes. “Portuguese Advance Directives-a Twist Against Futility? A Cross Sectional Study”. São Paulo Medical Journal 142, no. 3 (March 27, 2025): 1–7. Accessed October 16, 2025. https://periodicosapm.emnuvens.com.br/spmj/article/view/3030.