Correction to: Scientific Reports https://doi.org/10.1038/s41598-017-08164-x, published online 10 August 2017

The original version of this Article incorrectly included Zhi Zhang as a corresponding author. For correspondence and requests for materials, please contact Rihuan Cong (congrh@mail.hzau.edu.cn). This error has now been corrected in the PDF and HTML versions of this Article.