方法采用流行病学回顾性调查方法，对济宁市3年流腮报告病例的流行特征进行分析。
Methods a retrospective epidemiological investigation was conducted to understand the epidemiological features of the reported cases in the 3 consecutive years in the city of Jining.
方法采用流行病学回顾性调查方法，对济宁市3年流腮报告病例的流行特征进行分析。
Methods a retrospective epidemiological investigation was conducted to understand the epidemiological features of the reported cases in the 3 consecutive years in the city of Jining.
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