Scientific Reports 6: Article number: 32834; published online: 07 September 2016; updated: 13 October 2016

The original version of this Article contained an error in the spelling of the author Anna L. Trivett, which was incorrectly given as Trivett L. Anna.

The Author Contributions Statement,

Conception and design, drafting of the article: X.C. and J.J.O. Performance and analysis of experiment: X.C., Y.N., H.X., A.J.S., N.Y.S. and T.L.A. Critical revision of the article for important intellectual content: B.Z.X. and D.Y.

now reads:

Conception and design, drafting of the article: X.C. and J.J.O. Performance and analysis of experiment: X.C., Y.N., H.X., A.J.S., N.Y.S. and A.L.T. Critical revision of the article for important intellectual content: B.Z.X. and D.Y.

This has now been corrected in the PDF and HTML versions of the Article.