A Case-control Study of Gastric Cancer and Nutritional Factors in Marseille, France.

病例对照研究胃癌和营养因素，在马赛，法国。

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Methods a case-control study was conducted in Xicheng District and Haidian District of Beijing in 2004.

方法于2004年在北京市西城区和海淀区进行病例对照调查。

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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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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?