Sentence: In addition , stimulation of erythropoiesis with recombinant human erythropoietin , supplemental iron therapy , and improving haemostasis by aprotinin may further reduce homologous blood requirements .
Drug combination annotation:
[{'class': 'POS', 'spans': ['erythropoietin', 'iron', 'aprotinin'], 'is_context_needed': True}]