Integrating the Urea-to-Creatinine Ratio with Clinical Variables to Improve Etiological Discrimination in Acute Kidney Injury - Luca Malatesta; Marco Allinovi; Sofia Brucia; Mariapia Carafa; Sara Dal Lago; Glenda Cancila; Alberto Parise; Chiara Giannini; Francesco Peyronel (Journal of Clinical Medicine, 2026)