Updates are available Correction dated 2014-07-09
Click to view Correction: https://doi.org/10.1038/511138b
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First Online: 25 June 2014
Change Date: 4 July 2014
Change Type: Correction
Change Details: A typographical error in this story meant that the wrong date was given for the 11 September 2001 attacks. This has now been corrected.
Change Date: 9 July 2014
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1038/511138b
Free to read: This content has been made available to all.
