Sentence: Epidural analgesia during labor--0.5 % lidocaine with fentanyl vs. 0.08 % ropivacaine with fentanyl .
Drug combination annotation:
[{'class': 'COMB', 'spans': ['lidocaine', 'fentanyl'], 'is_context_needed': True}, {'class': 'COMB', 'spans': [2, 3], 'is_context_needed': True}]