Referral bias in ALS epidemiological studies.

PLoS One · 2018 · PMC5901916 · PMID 29659621

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a possible trendno p-value reported

This study suggests a possible trend to referral bias in cohorts of ALS patients drawn solely from referral or hospital databases.

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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.