The Flipped Classroom: A Critical Appraisal.

West J Emerg Med · 2019 · PMC6526887 · PMID 31123556

Europe PMC DOI

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may be significantno p-value reported

In fact, our review found that preparation in terms of cost and faculty time may be significant and this should be considered prior to implementing the FC model.

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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.