Scientific Reports 3, Article number: 1258 (2013); Published: 13 February 2013; Updated: 1 March 2013

Due to a typesetting error, the authors C. Liberale, R. La Rocca, L. Ferrara and V. Rajamanickam were incorrectly listed as being affiliated with KAUST (King Abdullah University of Science and Technology), PSE and BESE divisions, Jeddah, Saudi Arabia. This has now been corrected in both the PDF and HTML versions of the Article.