For over 50 years, Drug and Therapeutics Bulletin has provided rigorous independent evaluations of drugs and treatments. To do this we rely on the availability of, and access to, comprehensive data from many sources. A hierarchy of validity exists and DTB seeks always to use the highest quality evidence published in an open environment where it is possible to evaluate trial methodology, rationale and results. In this way, the basis for our conclusion is available for independent assessment and challenge. We believe that this is an important principle that should apply to all types of information presented to healthcare …