SACCO, Rosario et al. A new frailty index as a risk predictor of morbidity and mortality: its application in a Surgery Unit. European Journal of Oncology and Environmental Health, [S. l.], v. 23, n. 1, p. 41–46, 2018. Disponível em: https://www.mattioli1885journals.com/index.php/EJOEH/article/view/6938. Acesso em: 20 jan. 2026.