The study examined residents participating in the Chicago Healthy and Aging Project (CHAP), a population-based epidemiologic study of residents 65 years or older.

研究调查了参与芝加哥健康与老龄项目(CHAP)的居民。这是一个65岁及以上居民人群流行病学研究。

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Objective to monitor the distribution and resistance of enteric pathogenic bacteria in Beijing area to offer the data for guiding epidemiologic study and clinical treatment.

目的监测北京地区肠道致病菌的组成及耐药状况，为本地区的流行病学研究及临床合理用药提供依据。

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Objective to monitor the distribution and drug resistance of enteric pathogenic bacteria in some areas of Beijing to offer the basis for guiding epidemiologic study and clinical treatment.

目的监测北京部分地区肠道致病菌的组成及耐药状况，为本地区的流行病学研究及临床合理用药提供依据。

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Second, in an ecologic analysis, one cannot control for confounding factors as one can in an analytic epidemiologic study.

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In fact, Leszczynski appears to be far out of his depth in venturing to explicate and criticize an epidemiologic study.

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Like all epidemiologic studies, the Danish study is not perfect, but its strengths should also be acknowledged.

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