Correction to: Scientific Reports https://doi.org/10.1038/s41598-017-01616-4, published online 03 May 2017

The Acknowledgements section in this Article was omitted. The Acknowledgements section should read:

“This work was supported in part by the National Natural Science Foundation of China (Grant 61427802) and in part by the Science and Technology Innovation Plan of Beijing Institute of Technology (Grant 2016CX01002).”