Design: Prospective, single-center-based cohort study.

研究设计：前瞻性、单中心队列研究。

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Maternal vaccination against H1N1 influenza and offspring mortality: population based cohort study and sibling design.

孕妇接种甲型H1N1流感和后代的死亡率：基于人群的队列研究和兄弟设计。

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Study area women were enrolled at 20-26 weeks' gestation in a prospective population-based cohort study that was conducted from 2003 to 2005.

2003年至2005年进行的前瞻性以人群为基础的群组研究项目在研究地区招募了怀孕20—26周的妇女。

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The strengths of the Swedish study reviewed here include the large population based prospective cohort design along with the long period of follow up to validate the composition of the kidney stones.

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Other limitations of the Swedish study reviewed here include the fact that it was based on an observational cohort and that we cannot obviously know the other lifestyle factors of the cohort which may have contributed to stone formation.

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