To our knowledge, only a recent population-based prospective study conducted in Italy investigated the issue.
就我们所知，意大利只是最近有一个基于人群的前瞻性研究涉及这个问题。
The Singapore Chinese Health Study, funded by the U. S. National Institutes of Health, National Cancer Institute, is a population-based prospective study initiated between 1993 and 1998.
新加坡华人健康研究是由美国国立健康协会及国立肿瘤协会赞助的，是在1993年至1998年间一项基于人群的前瞻性研究。
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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