Sentence: [ Aztreonam or gentamicin combined with piperacillin as empiric antibiotic therapy during neutropenia of patients with hematologic diseases ] .
Drug combination annotation:
[{'class': 'POS', 'spans': ['Aztreonam', 'piperacillin'], 'is_context_needed': True}, {'class': 'POS', 'spans': [1, 2], 'is_context_needed': True}]