We conducted a historical cohort study of consecutive indigenous birth cohorts between 1 April 1998 and 28 February 2005.

针对1998年4月1日至2005年2月28日连续出生的土著婴儿群组开展了历史群组研究。

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Then, when I was on a sabbatical in Stockholm, I had the opportunity to get involved with the Swedish Twin Registry, a large cohort study in which some researchers were looking at cognition.

然后，当我在斯德哥尔摩休假时，有机会参与了瑞典的双胞胎人员的登记工作，它是一个大型的队列研究项目，其中的一些研究人员正在着眼于认知的问题。

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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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