Strategies for successful trauma registry implementation in low- and middle-income countries-protocol for a systematic review.

Syst Rev · 2018 · PMC5822522 · PMID 29467037

Europe PMC DOI

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may be significantno p-value reported

For example, there may be significant heterogeneity in the studies as well as moderate to high risk of bias.

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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.