Many researchers fault case-control work as being a weak method for showing direct causality, especially because it is subject to substantial recall bias.

很多研究员都指责案例对照法不是展现因果关系直接有力的方法，尤其因为它受制于大量的记忆误差。

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After the market closed Thursday Conceptus, which makes a nonincisional permanent birth control method, cut its second-quarter and full-year outlooks, citing the weak economy and high unemployment, which it said is causing would-be patients to put off their doctor visits.

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The cybercriminals' exploit uses an increasingly common method to decide which pages to infect: Google searches that probe sites en masse for hackable weak points.

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