Consistency, completeness and external validity of ethnicity recording in NHS primary care records: a cohort study in 25 million patients’ records at source using OpenSAFELY
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author: Rohini Mathur, Lisa E M Hopcroft, Helen J Curtis, Seb Bacon, George Hickman, David Evans, Chris Bates, Ben Goldacre, Brian MacKenna, Laurie A Tomlinson, Alex J Walker, William Hulme
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