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What is the difference between traditional cohort establish and cohort definition in Atlas?

@Chris_Knoll @Patrick_Ryan
I want to design a complete cohort information system for Master Graduation Design.
In my opinion, we collect baseline data and follow-up data,and this process may be called cohort establish. However, the cohort definition in Atlas is more like filtering patients having specific characteristics from CDM.I may misunderstand it. Can you help me understand it correctly? Thank you!

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