A third of systematic reviews changed or did not specify the primary outcome: a PROSPERO register study

Andrea C. Tricco; Elise Cogo; Matthew J. Page; Julie Polisena; Alison Booth; Kerry Dwan; H. Robson MacDonald; Tammy Clifford; Lesley Stewart; Sharon E. Straus; David Moher

doi:10.1016/j.jclinepi.2016.03.025

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