Stability of important antibodies for kidney disease: pre-analytic methodological considerations.

PeerJ · 2018 · PMC6042478 · PMID 30013843

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an increasing trendno p-value reported

However, when serum is stored for 6 weeks or longer, antibody concentration exhibits an increasing trend.

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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.