Soviero, F., et al. “Bleeding in Orthopedic Surgery: Role of Blood Transfusion and Erythropoietin Alpha”. Acta Biomedica Atenei Parmensis, vol. 81, no. 2, Sept. 2010, pp. 125-9, https://mattioli1885journals.com/index.php/actabiomedica/article/view/321.