See original article:
In the article by Krahn et al, “Systematic Assessment of Patients With Unexplained Cardiac Arrest: Cardiac Arrest Survivors With Preserved Ejection Fraction Registry (CASPER),” which appeared in the July 28, 2009 issue of the journal (Circulation. 2009;120:278–285), the current Table 2 is not correct and should be replaced by the following table:
The change has been made to the current online version of the article. The authors regret the error.