关键词:左氧氟沙星;细菌感染;随机对照;多中心临床试验 [gap=1714]Key words; Levofloxacin; Bacterial infections; Randomized; Multicenter clinical study
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a multicenter clinical study 多中心临床观察
a randomized multicenter clinical study 多中心随机对照研究
randomized controlled multicenter clinical study 随机对照多中心临床研究
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