The article entitled “Call in the backup” in the November 2012 issue (Nat. Med. 18, 1602–1606, 2012) misspelled Rajesh Ranganathan's first name as Rajan. The error has been corrected in the HTML and PDF versions of the article.

In the January 2013 issue, the article entitled “NIH will withhold grant money to enforce public-access policy” (Nat. Med. 19, 3, 2013) incorrectly stated that the NIH publishes journals' submission policies when they actually only provide a search tool to assist researchers in determining the policy. The article also incorrectly stated that 25% of researchers don't comply with the policy, when, in fact, 25% of articles don't comply. The errors have been corrected in the HTML and PDF versions of the article.