The quality of evidence for medical interventions does not improve or worsen: a metaepidemiological study of Cochrane reviews

Jeremy Howick; Despina Koletsi; Nikolaos Pandis; Padhraig S. Fleming; Martin Loef; Harald Walach; Stefan Schmidt; John P A Ioannidis

doi:10.1016/j.jclinepi.2020.08.005

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The quality of evidence for medical interventions does not improve or worsen: a metaepidemiological study of Cochrane reviews

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