Objective Analysis the characteristics of serious traffic trauma death cases and Causes of death.
目的分析严重交通伤死亡病例的特点及死亡原因。
Methods the death causes of DN and it correlated factors were studied by using retrospective analysis.
方法采用回顾性分析方法，探讨DN的死亡原因及相关因素。
Objective To analysis the trend of maternal death time and explore the impact of the variety of death causes and birth place to maternal death time.
目的 分析北京市孕产妇死亡时间变化趋势及孕产妇死亡原因、分娩地点等因素对孕产妇死亡时间的影响。
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