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【摘 要】
：
Background The extended spectrum β-lactamase (ESBL)-producing Escherichia coli (E.coli) and Klebsiella pneumoniae (K.pneumoniae) are the major pathogens causi
【机 构】
：
Department of Respiratory & Critical Care Medicine,Department of Respiratory Medicine,Beijing Instit
【出 处】
：
中华医学杂志（英文版）
【发表日期】
：
2004年期
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