On page 4076 in the 25 June 2015 issue, reference to financial support from the British Heart Foundation was omitted. In the Acknowledgments, the first sentence of the second paragraph should have read: “This work was supported by the British Heart Foundation (CH/03/003), the Deutsche Forschungsgemeinschaft (Sonderforschungsbereich 688 [B.N.] and Sonderforschungsbereich 914/TP A02 [B.W.]), and the Rudolf Virchow Center.” The error has been corrected in the online version, which now differs from the print version.

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