Evolution of the study groups in the follow-up study.
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https://figshare.com/articles/dataset/_Evolution_of_the_study_groups_in_the_follow_up_study_/903302
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资源简介：
Study groups were based on the original population samples that were used in the first survey. The study groups became step-wise smaller because of lack of response to the first survey, denying further contact, and lack of response to the follow-up survey.
创建时间：
2014-01-17
