Zia Ziabari, S. M., Rimaz, S., Shafaghi, A., Shakiba, M., Pourkazemi, Z., Karimzadeh, E., & Amoukhteh, M. (2019). Blood Urea Nitrogen to Creatinine ratio in Differentiation of Upper and Lower Gastrointestinal Bleedings; a Diagnostic Accuracy Study. Archives of Academic Emergency Medicine, 7(1), e30. https://doi.org/10.22037/aaem.v7i1.400