方法：“居民死亡医学证明书”，结合回顾性调查，获取相关数据。
Methods: Combining with retrospective investigation, the relevant data were obtained from medical certification for residents' death reported by surveillance of all kinds of disease.
方法：“居民死亡医学证明书”，结合回顾性调查，获取相关数据。
Methods: Combining with retrospective investigation, the relevant data were obtained from medical certification for residents' death reported by surveillance of all kinds of disease.
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