Savović J, Jones HE, Altman DG, Harris RJ, Jüni P, Pildal J, Als-Nielsen B, Balk EM, Gluud C, Gluud LL, Ioannidis JPA, Schulz KF, Beynon R, Welton NJ, Wood L, Moher D, Deeks JJ, Sterne JAC (2012)
Influence of reported study design characteristics on intervention effect estimates from randomized controlled trials. Annals of Internal Medicine 157:429-438.

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