采用现场流行病学调查方法。
方法采用现场流行病学调查分析，并对收集的数据进行常规统计学处理。
Epidemiological investigation was made on site; the data was collected and analyzed.
方法通过现场流行病学方法进行调查。
Methods Epidemiological field research method was adopted to study it.
方法：采用流行病学现场调查方法。
Methods:We adopted Epidemical Field Investigation method to study it.
方法：采用流行病学现场调查方法。
Methods:We adopted Epidemical Field Investigation method to study it.
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