Tool 'names and shames' hidden drug trials Institutions that fail to report the results of their drug and medical trials will be named on a new website.
Trials Tracker logs which clinical trials have missed deadlines for reporting their results in the US.
Some pharmaceutical organisations have been accused of burying unfavourable drug and medical test results.
Dr Ben Goldacre, who devised the website, told the BBC he hoped it would "nudge" institutions into properly disclosing data.
"For many years, trials transparency has been neglected," he said. BBC News