The Cochrane Collaboration says at least two-thirds of its review authors will have to be totally free of conflicts of interest in a new drive to improve trust in its work.

Currently half of the authors on any Cochrane review are meant to be free from conflicts of interest.

The change is just one element of its revamped policy, announced this month (see box).

And Cochrane editor-in-chief Dr Karla Soares-Weiser says the organisation will aim to free Cochrane systematic reviews completely of any commercial influence as soon as possible.