Influence of reported study design characteristics on intervention effect estimates from randomised controlled trials: combined analysis of meta-epidemiological studies by J Savović, HE Jones, DG Altman, RJ Harris, P Jűni, J Pildal, B Als-Nielsen, EM Balk, C Gluud, LL Gluud, JPA Ioannidis, KF Schulz, R Beynon, N Welton, L Wood, D Moher, JJ Deeks, JAC Sterne

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