Zia Ziabari, Seyyed Mahdi, Siamak Rimaz, Afshin Shafaghi, Maryam Shakiba, Zahra Pourkazemi, Elnaz Karimzadeh, and Melika Amoukhteh. “Blood Urea Nitrogen to Creatinine Ratio in Differentiation of Upper and Lower Gastrointestinal Bleedings; A Diagnostic Accuracy Study”. Archives of Academic Emergency Medicine 7, no. 1 (June 10, 2019): e30. Accessed May 2, 2024. https://journals.sbmu.ac.ir/aaem/index.php/AAEM/article/view/400.