DEMIR, Elvan; ÖZTAŞ, İsmail; YAVA, Ayla; KOYUNCU, Aynur. Investigation of the Relationship Between Frailty and Sleep Quality in Postoperative Elderly Patients: A Descriptive Cross-Sectional Study. The European Research Journal, [S. l.], p. 1–10, 2026. DOI: 10.18621/eurj.1278. Disponível em: https://www.eurj.org.tr/article/view/1278. Acesso em: 25 jun. 2026.