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Can the CDM mapping exercise be carried out on a source database with some of the fields pseudonymised?

Hi everyone,

I wanted to ask for some community input on whether it would be best practice to do the OMOP CDM conversion on a source database which might have some of its fields pseudonymised?

Many thanks,

Best practice is to ETL from as close as possible to the original source data.

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thank you @MPhilofsky