Intravenous Ferric Carboxymaltose (Ferinject®) With or Without Erythropoietin in Patients Undergoing Orthopaedic Surgery

iv administration in Arm 1 placebo NaCl 0.9% In arm 2 iv administration of Ferinject ® and subcutaneous NaCl 0.9 % as an EPO placebo In arm 3 iv administration of Ferinject ® and subcutaneous EPO