Sentence: The aim of this study was to evaluate all E. coli positive blood cultures collected during a 4-y period in a haematological department using piperacillin plus netilmicin for empiric treatment of febrile episodes .
Drug combination annotation:
[{'class': 'COMB', 'spans': ['piperacillin', 'netilmicin'], 'is_context_needed': True}]