The challenges, advantages and future of phenome-wide association studies.

Immunology · 2014 · PMC3904236 · PMID 24147732

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may be significantno p-value reported

There may be significant differences in clinical care, and the use of ICD9 codes, that is observed in different ethnicities, between different physicians, and across different healthcare providers.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.