A controlled trial of a prostacyclin and rt-PA in the treatment of severe frostbite.

n engl j med 364;2 nejm.org january 13, 2011 189 described in the published reports,1,2 this calculation was erroneously made on the basis of the right eye only, resulting in fewer events as well as fewer people in whom a change in visual acuity could be ascertained. The published and revised numbers are presented in Table 1; the article is correct at NEJM.org. These changes do not materially change the conclusions of the study.