Questionnaire return and non-return at each follow-up time.
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下载链接：
https://figshare.com/articles/dataset/_Questionnaire_return_and_non_return_at_each_follow_up_time_/718725
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资源简介：
(a)Number of questionnaires returned at the time indicated.
(b)Number (%) of questionnaires not returned at the time indicated.
创建时间：
2015-12-02
