A retrospective survey of the deaths caused by malignant tumor in 11 years was carried out at the Beijing Coking and Chemical Works.
我们对北京焦化厂2,106人进行了恶性肿瘤死亡十一年回顾性调查。
Methods: Causes of diseases and death in hospitalized military pilots in a certain region during 45 years were investigated and analysed with a retrospective survey.
方法：采用回顾性调查方法对某地区45 年间住院军事飞行人员病伤死亡病例进行分析。
Objective A retrospective survey of 187 patients who underwent canal down mastoidectomy was performed in order to improve the outcome of the operation , emphasizing on otorrhea.
目的通过对187例开放式乳突手术后耳漏的情况进行回顾性分析，以提高开放式乳突手术的治疗效果。
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