Scientific Reports 6: Article number: 27074; published online: 01 June 2016; updated: 25 July 2016

This Article contains errors in the Author Contributions Statement.

“Conceived and designed the experiments: W.Y.Z. and W.T.Q. Performed the experiments, analyzed the data and wrote the paper: W.T.Q. Revised and approved the final version of the paper: W.Y.Z”.

should read:

“Conceived and designed the experiments: W.Y.Z. Performed the experiments, analyzed the data and wrote the paper: W.T.Q. Revised the manuscript and approved the final version of the paper: W.Y.Z”.