她的结论是基于一项对11473名美国人进行的全国性抽样调查得出的。
Her information is based on a nationally representative study sampling 11,473 Americans.
在该研究中，通过全国性抽样调查，他们每年随机选定5000名芬兰人邮寄问卷收集自我报告的饮酒情况。
In this study, self-reported drinking was collected through a nationally representative survey mailed annually to 5, 000 randomly selected Finnish citizens.
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