研究自愿者填写了RLS调查问卷，测量了他们睡眠过程中的周期性肢体的运动，并提供了血液样本。
The study volunteers filled out RLS questionnaires, had their periodic limb movements measured during sleep and gave blood samples.
本文研究是利用102家只发行A股的上市公司为样本，对自愿性信息披露水平进行回归分析。
This study is based on a sample of 102 listed Chinese companies that only have A-shares Stock Exchange.
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