Statistics from Altmetric.com
The letter by Kaufmann1 is quite reassuring as it demonstrates that policy researchers have intuitively and astutely questioned simple evidence hierarchies and were sceptical about using study design or study label as a surrogate for validity. This was the impetus for proposing our revised pyramid.
The letter also reminds us that there are higher order scientific publications (guidelines and …
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.