One of the potentially most useful features of the Cochrane Library is the “Add/View Feedback” link positioned (alas, not very conspicuously) towards the bottom of the menu that appears each time a review (or a protocol for a review) is selected. Users of the Library can leave their own comments or criticisms and see what others might have said. It is possible, for example, to query the approach that reviewers have described in their protocol or to draw attention to new trials published since a review was last updated. Like other Cochrane review groups, however, …