# 是否包括所有研究？

不。赞助商和研究者根据法律、政策或自愿的选择，向ClinicalTrials.gov数据库递交数据。

世界各地的法律和政策要求(set expectation)临床试验应该在公共数据库（例如ClinicalTrials.gov）上进行登记。美国有法律、法规和政策要求赞助商和研究者递交<mark style="background-color:blue;">某些类型的临床试验(certain types of clinical trials)</mark>资料到公共数据库。非常少数的政策要求赞助商和研究者将<mark style="background-color:blue;">观察性研究</mark>列入公共数据库。

对于法律或政策没有要求递交的研究，赞助商和研究者可以自行选择是否上传数据到例如ClinicalTrials.gov。但如果他们选择在ClinicalTrials.gov上列出该研究，他们必须及时更新研究记录。

了解更多有关研究资料递交的规则和法律，请参阅Selected Trial Registration Laws and Policies。


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