A case control study nested in cohort was conducted.

本文进行了一项队列内病例对照研究。

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Methods This is a case control study. 40 type 2 diabetic patients with gallstones(DG)and 40 type 2 diabetic patients without gallstones(NDG)were enrolled.

方法采用病例对照研究的方法，观察2型糖尿病伴胆囊结石组（DG）及不伴胆囊结石组（NDG）各40例。

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Methods Reviewing investigation was used for the MV coverage rate and immunization efficacy (ve), a case control study was carried for seeking risk factors.

方法采用回顾性调查研究方法计算麻疹疫苗(MV)效力(VE)，采用病例对照研究进行传播因素分析。

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First, it is a retrospective case-control study and is therefore susceptible to reporting bias, meaning that people with ALS may report their coffee consumption differently from controls.

FORBES: Does Coffee Drinking Really Protect Against Devastating Diseases?