OZDEMIR, Gorkem; SÖZÜTEK, Alper. Comparison of preoperative and postoperative frailty in elderly following gastrointestinal cancer surgery. The European Research Journal, [S. l.], v. 11, n. 4, p. 753–761, 2025. DOI: 10.18621/eurj.1622647. Disponível em: https://eurj.org.tr/article/view/1070. Acesso em: 5 apr. 2026.