Unverified50% confidenceFactExact time
观察性研究常见设计包括队列研究、病例对照研究和横断面研究
1
Sources
50%
Confidence
Long-term
Relevance
7/8/2026
First Seen
Sources
In Praise of Observational Evidence: When Randomized Controlled Trials Can't Answer Everything
hackernewshackernews7/1/2026
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