In the November 2013 issue, the article entitled “Trial designs advance to overcome bitter pill of placebo effect” (Nat. Med. 19, 1353, 2013) incorrectly quoted Richard Pops as saying that SPCD trials enable power with smaller ends, when it should have said a smaller number of subjects. The error has been corrected in the HTML and PDF versions of the article.
The online version of the original article can be found at 10.1038/nm1113-1353
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Correction. Nat Med 19, 1550 (2013). https://doi.org/10.1038/nm1213-1550b