Scientific Reports 3, Article number: 1263 10.1038/srep01263 (2013); Published: February122013; Updated: February222013
The original version of this Article contained a typographical error in the DOI, 10.1038/srep01263, which was incorrectly given as 0.1038/srep01263. This has now been corrected in both the PDF and HTML versions of the Article. Furthermore, the supplementary movie was omitted from the original version of this Article. This has now been added as online supplementary material.
