Scientific Reports 6: Article number: 30215; published online: 03 August 2016; updated: 22 March 2017.

The original version of this Article contained an error in the order of author names, which were incorrectly given as ‘Jing Lin, Wei-qing Shao, Zong-you Chen, Wen-wei Zhu, Lu Lu, Duan Cai, Lun-xiu Qin, Hu-liang Jia, Ming Lu & Jin-hong Chen’.

These errors have now been corrected in the PDF and HTML versions of the Article.