左氧氟沙星500 mg每天1次治疗细菌性下呼吸道感染的疗效观察
좌양불사성500 mg매천1차치료세균성하호흡도감염적료효관찰
Observation on clinical effects of intravenous levofloxacin 500 mg once-daily vs 300 mg twice-daily in the treatment of lower respiratory tract bacterial infections
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