Mehmet Esat Duymus, et al. “Prognostic Value of Prognostic Nutritional Index (PNI) for 5-Year Recurrence-Free Survival in surgically Resected Gastrointestinal Stromal Tumor”. Annali Italiani Di Chirurgia, vol. 94, no. 1, Jan. 2023, pp. 19-26, https://annaliitalianidichirurgia.it/index.php/aic/article/view/978.