Effect of funding source on publication bias is not so clear cut

Of the 150 unpublished industry funded studies, 38 (25%) had results available on ClinicalTrials.gov, whereas none of the 11 unpublished trials funded by the National Institutes of Health or the 20 unpublished trials with other funding sources provided results in this database. Role of editorial and peer review processes in publication bias: analysis of drug trials submitted to 8 medical journals.