A review of the management of phantom limb pain: challenges and solutions.

J Pain Res · 2017 · PMC5558877 · PMID 28860841

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may be significantno p-value reported

GRADE has been said to overcome some of the arbitrariness of other categorization systems which weigh particular research methods, even when there may be significant biases present in individual studies using those methods.

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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.