Scientific Reports 6: Article number: 28920; published online: 04 July 2016; updated: 12 August 2016.

The original version of this Article incorrectly listed ‘School of Material and Chemical Technology, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-Ku, Tokyo 152-8550, Japan’ as a present address for K. Komatsu. This error has now been corrected in the HTML and PDF versions of the Article.