“Risk Factors Associated With Hyporesponse to Erythropoietin in Chronic Kidney Disease Patients on Hemodialysis Who Present anemia.: A Multicenter Observational Study”. Revista De La Sociedad Ecuatoriana De Nefrología, Diálisis Y Trasplante, vol. 12, no. 1, Feb. 2024, pp. 64-71, https://doi.org/10.56867/68.