Systematic review of the empirical evidence of study publication bias and outcome reporting bias. by Kerry Dwan, Douglas G Altman, Juan A Arnaiz, Jill Bloom, An-Wen Chan, Eugenia Cronin, Evelyne Decullier, Philippa J Easterbrook, Erik Von Elm, Carrol Gamble, Davina Ghersi, John P A Ioannidis, John Simes, Paula R Williamson

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