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Prominent medical journals often provide insufficient information to assess the validity of studies with negative results.
Hebert RS, Wright SM, Dittus RS, Elasy TA
J Negat Results Biomed 2002, 1:1
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Discrepancies in sample size calculations and data analyses reported in randomised trials: comparison of publications with protocols.
Chan AW, Hróbjartsson A, Jørgensen KJ, Gøtzsche PC, Altman DG
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