Previous Article Next Article Table of Contents Nature, Vol.558, No.7710, 361-364, 2018 DOI10.1038/d41586-018-05414-4 Export Citation Four principles for synthesizing evidence Donnelly CA, Boyd I, Campbell P, Craig C, Vallance P, Walport M, Whitty CJM, Woods E, Wormald C Please enable JavaScript to view the comments powered by Disqus.